Urogenital Anatomy

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Questions and Answers

Which nerve of the lumbar plexus arises from T12?

  • Subcostal (correct)
  • Femoral
  • Ilio-inguinal
  • Ilio-hypogastric

What does the ilio-inguinal nerve innervate?

  • Skin of the posterior thigh
  • The gluteal muscles
  • Skin of the superior anteromedial thigh and genital region (correct)
  • Skin of the anterolateral abdominal wall

Where does the ilio-hypogastric nerve pass in relation to the quadratus lumborum?

  • Anterior surface (correct)
  • Posterior surface
  • Medial aspect
  • Lateral aspect

What is the main function of the inferior vena cava?

<p>To drain blood from the lower body to the heart (D)</p> Signup and view all the answers

What muscle is innervated by the lateral femoral cutaneous nerve of the lumbar plexus?

<p>Tensor fasciae latae (D)</p> Signup and view all the answers

What tributaries drain into the left renal vein?

<p>Inferior phrenic vein (A), Left gonadal vein (C)</p> Signup and view all the answers

What does the thoracic duct ultimately drain into?

<p>Left subclavian vein (B)</p> Signup and view all the answers

Which structure corresponds with the origins of the intestinal lymphatic trunks?

<p>Celiac lymph nodes (D)</p> Signup and view all the answers

Which artery supplies the diaphragm?

<p>Inferior phrenic artery (C)</p> Signup and view all the answers

What is the role of the lumbar plexus in the body?

<p>Innervates the lower limbs (C)</p> Signup and view all the answers

What is located anterior to L1 and L2 as part of the lymphatic system?

<p>Cisterna chyli (B)</p> Signup and view all the answers

Which of the following veins ascend alongside the lumbar vertebrae?

<p>Inferior vena cava (A)</p> Signup and view all the answers

Which muscle is not associated with the posterior abdominal wall?

<p>Rectus abdominus (A)</p> Signup and view all the answers

Which of the following lymph nodes lies around the origins of the arteries in the abdominal region?

<p>Celiac nodes (B)</p> Signup and view all the answers

What forms the inferior vena cava?

<p>Common iliac veins (C)</p> Signup and view all the answers

Which muscle is primarily responsible for flexing the thigh at the hip?

<p>Psoas Major (B)</p> Signup and view all the answers

What is the nerve supply of the Ilacus muscle?

<p>Femoral nerve (D)</p> Signup and view all the answers

Which ligament provides an attachment for the diaphragm over the aorta?

<p>Median arcuate ligament (C)</p> Signup and view all the answers

Which structure is NOT part of the lumbar plexus?

<p>Sciatic nerve (C)</p> Signup and view all the answers

What is the primary action of the Quadratus Lumborum?

<p>Lateral flexion of the trunk (D)</p> Signup and view all the answers

Which is the correct blood supply for the inferior surface of the diaphragm?

<p>Inferior phrenic arteries (C)</p> Signup and view all the answers

What are the vertebral levels for the Caval opening of the diaphragm?

<p>T8 (C)</p> Signup and view all the answers

Which component of the posterior abdominal wall has a major role in weight bearing?

<p>Lumbar vertebrae (C)</p> Signup and view all the answers

Which lymphatic structure is most associated with the posterior abdominal wall?

<p>Lumbar lymphatic trunks (B)</p> Signup and view all the answers

Which of the following is a characteristic feature of the lumbar vertebrae?

<p>Larger bodies compared to thoracic vertebrae (A)</p> Signup and view all the answers

What is the starting point of the abdominal aorta?

<p>T12 (B)</p> Signup and view all the answers

Which structure does the abdominal aorta bifurcate into?

<p>External and internal iliac arteries (A)</p> Signup and view all the answers

What type of branches does the anterior midline of the abdominal aorta primarily consist of?

<p>Unpaired visceral branches (B)</p> Signup and view all the answers

Which arteries are considered paired visceral branches of the abdominal aorta?

<p>Suprarenal and renal arteries (B)</p> Signup and view all the answers

Where does the abdominal aorta end?

<p>L4 (D)</p> Signup and view all the answers

Which structure passes posterior to the abdominal aorta?

<p>Left lumbar veins (B)</p> Signup and view all the answers

What is the role of the splanchnic nerves and ganglia?

<p>Innervate abdominal and pelvic viscera (C)</p> Signup and view all the answers

Which arteries are classified as unpaired parietal branches of the abdominal aorta?

<p>Median sacral artery (B)</p> Signup and view all the answers

Which fascia creates the medial arcuate ligament and is continuous with the iliac fascia?

<p>Psoas fascia (A)</p> Signup and view all the answers

What is the primary innervation of the diaphragm?

<p>Phrenic nerve (A)</p> Signup and view all the answers

Which type of drainage do the left inferior and left suprarenal veins specifically utilize?

<p>Inferior vena cava (IVC) (C)</p> Signup and view all the answers

What structure lies behind the peritoneum in the posterior abdominal wall?

<p>Retroperitoneal space (B)</p> Signup and view all the answers

Which of the following reflects a common misconception about the fascia in the posterior abdominal wall?

<p>All fascias connect to the peritoneum. (D)</p> Signup and view all the answers

Which nerves are primarily associated with sensory innervation in the abdominal region?

<p>Intercostal nerves (A)</p> Signup and view all the answers

What is the main artery supplying the posterior abdominal wall structures?

<p>Abdominal aorta (B)</p> Signup and view all the answers

Which fascia layer contributes to the formation of the lateral arcuate ligament?

<p>Quadratus lumborum fascia (C)</p> Signup and view all the answers

Which of the following statements about the lymphatic drainage in the context provided is correct?

<p>Lymphatic drainage is facilitated by lumbar lymphatic plexuses. (C)</p> Signup and view all the answers

What is the primary role of the sympathetic nerves within the posterior abdominal wall?

<p>To support visceral functions (D)</p> Signup and view all the answers

What is the primary purpose of materials made available by an electronic database?

<p>Personal study and research (A)</p> Signup and view all the answers

Which structure is prohibited from further reproduction according to the licensing conditions?

<p>Printed materials (B)</p> Signup and view all the answers

What is expected of individuals using materials from the database?

<p>To adhere to licensing conditions at all times (D)</p> Signup and view all the answers

Which of the following best describes the restrictions on printed materials?

<p>For class discussion, private study, and research only (A)</p> Signup and view all the answers

Which of the following actions would violate the licensing conditions for electronic databases?

<p>Sharing electronic materials on social media (B)</p> Signup and view all the answers

What is one of the key requirements when using these materials for study?

<p>Users must maintain compliance with licensing terms (A)</p> Signup and view all the answers

Which of the following describes the general nature of licensing conditions for the materials?

<p>They restrict the use for private study and research only (C)</p> Signup and view all the answers

What is the innervation of the adductor muscles of the medial thigh?

<p>Obturator nerve (C)</p> Signup and view all the answers

Where does the lateral femoral cutaneous nerve of the lumbar plexus pass in relation to the iliac crest?

<p>Under the inguinal ligament (C)</p> Signup and view all the answers

Which nerve is responsible for innervating the iliacus muscle?

<p>Femoral nerve (A)</p> Signup and view all the answers

What is the primary function of the femoral nerve?

<p>Innervation of hip flexors and knee extensors (C)</p> Signup and view all the answers

Which of the following statements about the genitofemoral nerve is correct?

<p>It divides into genital and femoral branches (B)</p> Signup and view all the answers

What is the primary function of the psoas major muscle?

<p>Flexes the thigh at the hip (C)</p> Signup and view all the answers

Which vertebral level corresponds to the aortic hiatus of the diaphragm?

<p>T12 (A)</p> Signup and view all the answers

Which ligament is associated with the attachment of the diaphragm over the aorta?

<p>Median arcuate ligament (D)</p> Signup and view all the answers

What anatomical feature of the lumbar vertebrae aids in weight bearing?

<p>Large kidney-shaped bodies (B)</p> Signup and view all the answers

What is the origin of the quadratus lumborum muscle?

<p>Transverse processes of L5 (D)</p> Signup and view all the answers

What nerve provides innervation to the iliacus muscle?

<p>Femoral nerve (A)</p> Signup and view all the answers

Which muscle acts as a weak flexor of the vertebral column?

<p>Psoas minor (B)</p> Signup and view all the answers

What is the orientation of the superior and inferior facets of the lumbar vertebrae?

<p>Superior facets face medially, inferior facets face laterally (B)</p> Signup and view all the answers

What supplies the blood to the inferior surface of the diaphragm?

<p>Inferior phrenic arteries (B)</p> Signup and view all the answers

What is the origin of the ilio-hypogastric nerve?

<p>L1 (B)</p> Signup and view all the answers

Which nerve innervates the skin of the anterolateral abdominal wall?

<p>Subcostal nerve (C)</p> Signup and view all the answers

The ilio-inguinal nerve traverses which structure to reach the inguinal canal?

<p>Transversus abdominis (C)</p> Signup and view all the answers

Which nerve is specifically responsible for innervating the superior anteromedial thigh?

<p>Ilio-inguinal nerve (C)</p> Signup and view all the answers

Where does the subcostal nerve pass in relation to the quadratus lumborum?

<p>Anterior surface (D)</p> Signup and view all the answers

What is the role of the lumbar plexus?

<p>Provide innervation to lower limb muscles (A)</p> Signup and view all the answers

What area does the ilio-inguinal nerve pass through in relation to the ASIS?

<p>Superficially to the ASIS (C)</p> Signup and view all the answers

Which nerve of the lumbar plexus does not arise from the lumbar region?

<p>Subcostal nerve (B)</p> Signup and view all the answers

In which area does the ilio-hypogastric nerve primarily innervate?

<p>Suprapubic region (B)</p> Signup and view all the answers

What structure does the ilio-inguinal nerve traverse to reach the inguinal region?

<p>Transversus abdominis (A)</p> Signup and view all the answers

Which of the following structures is NOT associated with the right inferior phrenic vein?

<p>Left inferior phrenic vein (C)</p> Signup and view all the answers

Which fascia forms the medial arcuate ligament in the posterior abdominal wall?

<p>Psoas fascia (C)</p> Signup and view all the answers

What type of nerves provide sensory innervation in the abdominal region?

<p>Intercostal and subcostal nerves (A)</p> Signup and view all the answers

Which of the following statements about the retroperitoneal space is correct?

<p>It contains the abdominal aorta and its branches. (D)</p> Signup and view all the answers

Which nerve is responsible for the motor innervation of the diaphragm?

<p>Phrenic nerve (B)</p> Signup and view all the answers

What is the primary content of the fascia lining the posterior abdominal wall?

<p>Continuous with muscle fascia (A)</p> Signup and view all the answers

Which structure lies between the parietal peritoneum and the muscles of the posterior abdominal wall?

<p>Retroperitoneal space (B)</p> Signup and view all the answers

Which of the following veins drains into the inferior vena cava?

<p>Right inferior phrenic vein (B)</p> Signup and view all the answers

Which layer contributes to the formation of the lateral arcuate ligament?

<p>Quadratus lumborum fascia (A)</p> Signup and view all the answers

Which statement about lymphatic drainage in the posterior abdominal wall is accurate?

<p>It drains into superior lumbar lymph nodes. (B)</p> Signup and view all the answers

What provides a layer of protection and support to the kidneys, according to their anatomical coverings?

<p>Paranephric fat (A)</p> Signup and view all the answers

Which structure is NOT included in the renal hilum?

<p>Renal cortex (B)</p> Signup and view all the answers

Which pole of the right kidney is positioned supremely above the right colic flexure?

<p>Inferior pole (D)</p> Signup and view all the answers

What is the primary layer of covering that directly surrounds the kidney?

<p>Renal capsule (C)</p> Signup and view all the answers

What is the role of the renal medulla in kidney function?

<p>It forms renal pyramids and collects urine. (A)</p> Signup and view all the answers

Which organ is located anteriorly to the left kidney and separated by peritoneum?

<p>Stomach (D)</p> Signup and view all the answers

What structures are found within the renal sinus?

<p>Major and minor calyces, renal pelvis, blood vessels (C)</p> Signup and view all the answers

Which anatomical layer encloses the kidneys, suprarenal glands, and perinephric fat?

<p>Renal fascia (C)</p> Signup and view all the answers

What is the primary role of the renal arteries?

<p>To supply blood to the kidneys (C)</p> Signup and view all the answers

What typically separates the right kidney from the liver?

<p>Peritoneum (C)</p> Signup and view all the answers

What are the three layers of coverings that surround the kidneys?

<p>Renal fascia, adipose capsule, renal capsule (A)</p> Signup and view all the answers

Which nerve primarily innervates the kidneys?

<p>Thoracic sympathetic nerves (A)</p> Signup and view all the answers

Which structure is located anterior to the right kidney?

<p>Liver (D)</p> Signup and view all the answers

What structure is part of the macroscopic anatomy of the kidney?

<p>Renal pelvis (D)</p> Signup and view all the answers

What is the primary blood supply to each kidney?

<p>Renal artery (B)</p> Signup and view all the answers

What anatomical feature of the kidney aids in its classification as retroperitoneal?

<p>Posterior to peritoneal cavity (C)</p> Signup and view all the answers

Where is the hilum of the left kidney located in relation to the spine?

<p>L2 vertebra (A)</p> Signup and view all the answers

What is a common function of the connective tissues surrounding the kidney?

<p>Support and protect the kidney (D)</p> Signup and view all the answers

How much do the positions of the kidneys change during respiration?

<p>2-3 cm (D)</p> Signup and view all the answers

What is the lymphatic drainage of the kidneys primarily responsible for?

<p>Removing waste products (A)</p> Signup and view all the answers

What is the primary function of the renal arteries?

<p>Providing oxygenated blood to the kidneys (B)</p> Signup and view all the answers

Which nerves contribute to sympathetic innervation of the kidneys?

<p>Least splanchnic nerve and L1 contributions (A)</p> Signup and view all the answers

Which structure lies posterior to the kidneys?

<p>Psoas major muscle (A)</p> Signup and view all the answers

What is true about the left renal vein in its anatomical position?

<p>It crosses midline posterior to the abdominal aorta. (A)</p> Signup and view all the answers

Which of the following provides the primary arterial supply to a specific segment of the kidney?

<p>Segmental arteries derived from renal arteries (C)</p> Signup and view all the answers

Which layer serves as the outermost covering of the kidneys?

<p>Renal fascia (C)</p> Signup and view all the answers

What is the relationship of the right kidney in terms of rib positioning?

<p>Adjacent to the 12th rib (C)</p> Signup and view all the answers

Which of the following best describes the renal lymphatic drainage?

<p>Drains into the lateral aortic (lumbar) nodes (A)</p> Signup and view all the answers

Which of the following structures provides the main parasympathetic innervation to the kidneys?

<p>Vagus nerve (A)</p> Signup and view all the answers

How does the renal artery on the right side differ from the left?

<p>The right renal artery is longer and passes posterior to the inferior vena cava. (A)</p> Signup and view all the answers

What is the length of the ureters?

<p>25-30 cm (C)</p> Signup and view all the answers

Which artery primarily supplies the abdominal part of the ureters?

<p>Renal artery (D)</p> Signup and view all the answers

At which point does the ureter experience a constriction?

<p>Crossing pelvic inlet (C)</p> Signup and view all the answers

What structure does the ureter pass through when it enters the urinary bladder?

<p>Bladder wall (A)</p> Signup and view all the answers

Which of the following best describes the relationship of the ureters during their abdominal course?

<p>Retroperitoneal structure (A)</p> Signup and view all the answers

In females, which artery crosses anteriorly over the abdominal part of the ureter?

<p>Ovarian artery (B)</p> Signup and view all the answers

What is the venous drainage corresponding to the blood supply of the pelvic part of the ureters?

<p>Internal iliac and gonadal veins (D)</p> Signup and view all the answers

What structure does the internal iliac artery primarily supply?

<p>Pelvic viscera (B)</p> Signup and view all the answers

Which artery is associated with the inferior aspect of the bladder in males?

<p>Inferior vesical artery (B)</p> Signup and view all the answers

What is a characteristic of the umbilical artery after birth?

<p>Becomes the medial umbilical ligament (A)</p> Signup and view all the answers

What is a role of the obturator artery?

<p>Supply pelvic muscles and ilium (C)</p> Signup and view all the answers

Which artery does the inferior vesical artery anastomose with?

<p>Superior vesical artery (B)</p> Signup and view all the answers

What is the primary function of the urinary bladder?

<p>To act as a temporary reservoir for urine (B)</p> Signup and view all the answers

Where is the urinary bladder located in adults when it is empty?

<p>Partially superior and posterior to the pubic bones (B)</p> Signup and view all the answers

Which structure surrounds the internal urethral orifice in males?

<p>Detrusor muscle (B)</p> Signup and view all the answers

What shape does the urinary bladder assume when it is empty?

<p>Pyramid-shaped (D)</p> Signup and view all the answers

During what age does the bladder typically begin to enter the pelvic cavity in children?

<p>Around 6 years of age (B)</p> Signup and view all the answers

What is the purpose of the smooth muscle loops around the ureteric orifices?

<p>Prevent backflow of urine (C)</p> Signup and view all the answers

What area of the bladder is referred to as the trigone?

<p>The area between the ureters and urethra (B)</p> Signup and view all the answers

What is the primary source of nerve supply to the ureters?

<p>Lumbar and sacral plexuses (C)</p> Signup and view all the answers

Which of the following surfaces of the bladder is covered with peritoneum?

<p>Superior surface (C)</p> Signup and view all the answers

Which of the following ligaments is associated with males?

<p>Puboprostatic ligament (C)</p> Signup and view all the answers

What artery supplies the fundus and neck of the urinary bladder in females?

<p>Vaginal artery (C)</p> Signup and view all the answers

Which nerves provide parasympathetic fibers to the urinary bladder?

<p>Pelvic splanchnic nerves (C)</p> Signup and view all the answers

Which structure is located posterior to the urinary bladder in females?

<p>Uterus (D)</p> Signup and view all the answers

What is the primary blood supply for the anterosuperior part of the male urinary bladder?

<p>Superior vesical artery (C)</p> Signup and view all the answers

Which anatomical feature aids in the drainage of the urinary bladder?

<p>Internal iliac nodes (D)</p> Signup and view all the answers

Which of the following describes the function of sympathetic fibers in males regarding the urinary bladder?

<p>Ejaculation control (B)</p> Signup and view all the answers

Where do the sympathetic fibers that supply the urinary bladder originate?

<p>Inferior thoracic and upper lumbar region (D)</p> Signup and view all the answers

Which structure forms the vesical venous plexus in males?

<p>Prostatic plexus (C)</p> Signup and view all the answers

What is the role of sympathetic nerves concerning pain sensation in relation to the urinary bladder?

<p>Transmit pain above pelvic pain line (B)</p> Signup and view all the answers

Which part of the female urethra is surrounded by the external urethral sphincter?

<p>Deep perineal pouch (B)</p> Signup and view all the answers

What is the length of the male urethra?

<p>20 cm (A)</p> Signup and view all the answers

What anatomical feature marks the prostatic part of the male urethra?

<p>Urethral crest (C)</p> Signup and view all the answers

Which glands open into the lateral margin of the external urethral orifice in females?

<p>Skenes' glands (D)</p> Signup and view all the answers

The spongy part of the male urethra is surrounded by which type of tissue?

<p>Erectile tissue (D)</p> Signup and view all the answers

Which section of the male urethra passes through the deep perineal pouch?

<p>Membranous part (B)</p> Signup and view all the answers

What is the primary function of the female urethra?

<p>Conveys urine only (B)</p> Signup and view all the answers

What feature characterizes the preprostatic part of the male urethra?

<p>Associated with the internal urethral sphincter (D)</p> Signup and view all the answers

What structure is found at the end of the male urethra?

<p>Navicular fossa (A)</p> Signup and view all the answers

Where does the male urethra begin?

<p>Base of the bladder (C)</p> Signup and view all the answers

At what week of embryogenesis do the metanephroi become functional?

<p>Week 10 (B)</p> Signup and view all the answers

What is the primary structure responsible for the formation of the urinary bladder?

<p>Urogenital sinus (A)</p> Signup and view all the answers

During the relocation of the kidneys, where do the kidneys move to?

<p>Lumbar region (D)</p> Signup and view all the answers

Which structure contributes to the formation of the common duct connecting the kidneys to the bladder?

<p>Ureteric ducts (B)</p> Signup and view all the answers

What anatomical consequence occurs due to the revascularization of the kidneys?

<p>Disappearance of the original renal artery (B)</p> Signup and view all the answers

What initiates the apoptosis of the common duct during the development of the urinary system?

<p>Contact with the urogenital sinus (D)</p> Signup and view all the answers

What structure does the ureteric bud originate from?

<p>Intermediate mesoderm (C)</p> Signup and view all the answers

In males, where does the mesonephric duct open after shifting during urinary system development?

<p>Prostatic urethra (B)</p> Signup and view all the answers

During which week does the mesonephros become functional?

<p>Week 6 (B)</p> Signup and view all the answers

Which nephric structure is characterized as the definitive structure responsible for urine formation?

<p>Metanephros (A)</p> Signup and view all the answers

Which structure is formed from the mesonephric tubules in males?

<p>Efferent ductules (D)</p> Signup and view all the answers

What is the primary function of the cap mesenchyme in metanephros development?

<p>Inducing ureteric bud branching (B)</p> Signup and view all the answers

From which embryonic layer does the smooth muscle of the bladder wall develop?

<p>Splanchinic mesoderm (D)</p> Signup and view all the answers

How does the position of the right kidney differ from that of the left kidney?

<p>It is lower than the left kidney (A)</p> Signup and view all the answers

What is the final structure formed by the fusion of the S-shaped renal vesicle and ureteric stalk?

<p>Uriniferous tubule (A)</p> Signup and view all the answers

Which part of the kidney forms from the ureteric bud?

<p>Collecting system (D)</p> Signup and view all the answers

What happens to the cranial mesonephri by the end of the fifth week?

<p>They regress, leaving fewer tubules (C)</p> Signup and view all the answers

What is the end product of nephrogenesis?

<p>Functional nephrons (B)</p> Signup and view all the answers

Which component of the kidney is crucial for filtering blood and forming urine?

<p>Glomerulus (B)</p> Signup and view all the answers

At what stage does the metanephros begin to develop lobes?

<p>By week 16 (D)</p> Signup and view all the answers

What is the primary structure that develops into the definitive kidney in humans?

<p>Metanephros (C)</p> Signup and view all the answers

Which embryological structure gives rise to the urinary bladder and urethra?

<p>Urogenital sinus (D)</p> Signup and view all the answers

During nephron formation, which of the following structures is critical for the induction of metanephric development?

<p>Ureteric bud (D)</p> Signup and view all the answers

What function does the ureteric bud perform during the development of the urinary system?

<p>Induces formation of collecting ducts (B)</p> Signup and view all the answers

Which term describes the process in which kidneys ascend from their original position during embryonic development?

<p>Kidney relocation (D)</p> Signup and view all the answers

What embryonic layer gives rise to the urogenital ridges, which are critical to urinary system development?

<p>Intermediate mesoderm (B)</p> Signup and view all the answers

Which nephric structure is functional during early development and can be observed in lower vertebrates?

<p>Mesonephros (D)</p> Signup and view all the answers

At which stage does the pronephros develop in humans before regressing?

<p>Around day 24/25 (D)</p> Signup and view all the answers

What major embryological event occurs as the mesonephric ducts fuse with the cloaca?

<p>Cavitation and formation of a lumen (D)</p> Signup and view all the answers

What is the role of the caudal end of the mesonephric duct during urinary system development?

<p>Induces the formation of the metanephros (A)</p> Signup and view all the answers

What role does the SRY gene play in sexual differentiation?

<p>It initiates the formation of testes in males. (C)</p> Signup and view all the answers

During which week do primordial germ cells begin their migration towards the mesonephric kidneys?

<p>Week 5 (A)</p> Signup and view all the answers

What structures are formed from the paramesonephric ducts in females?

<p>Uterine tubes and uterus (D)</p> Signup and view all the answers

What is the significance of somatic support cells in the development of gonads?

<p>They help in the formation of primordial follicles in ovaries. (B)</p> Signup and view all the answers

What is a key characteristic of external genitalia development in males?

<p>Descent of the testes into the scrotum (C)</p> Signup and view all the answers

What condition arises from a mutation in the androgen receptor gene?

<p>Androgen insensitivity syndrome (B)</p> Signup and view all the answers

What indicates a discordance between genetic, gonadal, and phenotypic sex?

<p>Presence of XY chromosomes and female phenotype (C)</p> Signup and view all the answers

Which of the following structures arises from the indifferent external genitalia?

<p>Clitoris and labia majora (B)</p> Signup and view all the answers

What hormonal factor is mainly responsible for male sex differentiation?

<p>Testosterone (A)</p> Signup and view all the answers

What do the proximal parts of the paramesonephric ducts develop into?

<p>Uterine tubes (D)</p> Signup and view all the answers

What structure do the fused caudal ends of the paramesonephric ducts form?

<p>Uterus (B)</p> Signup and view all the answers

Which of the following describes the role of the sinusal tubercle in female genital development?

<p>Expands to create the vaginal plate (A)</p> Signup and view all the answers

What is the function of the urorectal septum during genital development?

<p>Separates male and female structures (A)</p> Signup and view all the answers

During which week does the urethral groove form along the ventral surface of the urogenital plate?

<p>Week 6 (C)</p> Signup and view all the answers

What happens to the endodermal membrane that separates the vaginal lumen from the urogenital sinus?

<p>It degenerates after the 5th month (A)</p> Signup and view all the answers

What external structure forms as a result of the genital tubercle during the development of external genitalia?

<p>Clitoris (C)</p> Signup and view all the answers

How do the labioscrotal swellings relate to the development of external genitalia?

<p>They become the labia in females (A)</p> Signup and view all the answers

What are the cranial openings of the uterine tubes called?

<p>Infundibula (D)</p> Signup and view all the answers

What is the result of the presence of the SRY gene during fetal development?

<p>It causes the regression of paramesonephric ducts in males. (B)</p> Signup and view all the answers

What happens to the mesonephric ducts in females during development?

<p>They degenerate and do not contribute to female reproductive structures. (C)</p> Signup and view all the answers

How does the absence of male hormones affect the development of the gubernaculum?

<p>It leads to the formation of the round ligament of the uterus. (C)</p> Signup and view all the answers

During which developmental phase do the testes make their initial descent into the inguinal canal?

<p>Months 3 - 7 of pregnancy. (D)</p> Signup and view all the answers

What role does abdominal pressure play in the descent of the testes?

<p>It helps push the testes into the scrotum. (B)</p> Signup and view all the answers

Which structure develops from the paramesonephric ducts in females?

<p>Vagina. (C)</p> Signup and view all the answers

What occurs to the tunica vaginalis shortly before birth in males?

<p>It becomes obliterated. (B)</p> Signup and view all the answers

Which of the following correctly summarizes the development of external genitalia?

<p>Both sexes derive external genitalia from the same embryonic structures. (C)</p> Signup and view all the answers

What happens to the cranial suspensory ligament during the development of testes?

<p>It regresses during the descent phase. (B)</p> Signup and view all the answers

What is the role of somatic support cells in the development of the reproductive system?

<p>They provide support for the formation of testes or ovaries. (B)</p> Signup and view all the answers

What structure forms the glans urethra and external penile meatus during male external genitalia development?

<p>Glans plate (B)</p> Signup and view all the answers

What is the effect of dihydrotestosterone on the perineal region during male genital development?

<p>It facilitates the fusion of labioscrotal folds. (C)</p> Signup and view all the answers

In female external genitalia development, what becomes of the urethral folds?

<p>They become the labia minora. (B)</p> Signup and view all the answers

Which hormone is primarily responsible for the downstream effects leading to male genital structure development?

<p>Dihydrotestosterone (D)</p> Signup and view all the answers

Which part develops into the vestibule of the vagina during female external genitalia development?

<p>Phallic portion of urogenital sinus (D)</p> Signup and view all the answers

What anatomical structure does the gubernaculum extend to in both males and females?

<p>Diaphragm (C)</p> Signup and view all the answers

What happens to the labioscrotal swellings in female external genital development?

<p>They develop into labia majora. (A)</p> Signup and view all the answers

In male development, which folds fuse to enclose the penile urethra?

<p>Urethral folds (C)</p> Signup and view all the answers

What happens to the vaginal process in females during inguinal canal development?

<p>It usually degenerates. (B)</p> Signup and view all the answers

Which of the following does NOT occur during male external genitalia development?

<p>Formation of the clitoris. (A)</p> Signup and view all the answers

What do somatic support cells differentiate into in the absence of the SRY gene?

<p>Granulosa cells (A), Follicle cells (D)</p> Signup and view all the answers

Which structure develops from the paramesonephric ducts in female genital development?

<p>Uterine tube (A)</p> Signup and view all the answers

Which hormone is critical in promoting the differentiation of male genital ducts during weeks 8-12?

<p>Testosterone (C)</p> Signup and view all the answers

During which weeks do the seminal vesicles develop from the mesonephric duct?

<p>Weeks 10-12 (D)</p> Signup and view all the answers

What is the role of the surrounding mesenchyme in prostate gland development?

<p>It forms solid cords and differentiates into smooth muscle (A)</p> Signup and view all the answers

Which structure is primarily responsible for transporting ova from the ovaries to the uterus?

<p>Uterine tubes (D)</p> Signup and view all the answers

What is the primary function of the ovaries in the female reproductive system?

<p>Production of ova and hormones (C)</p> Signup and view all the answers

During fertilization, where does the sperm typically encounter the ovum?

<p>In the uterine tubes (A)</p> Signup and view all the answers

Which hormone is primarily produced by the ovaries and is crucial for the regulation of the menstrual cycle?

<p>Estrogen (B)</p> Signup and view all the answers

Which ligament provides support to the uterus and is crucial for maintaining its position in the pelvis?

<p>Round ligament of the uterus (A)</p> Signup and view all the answers

Which ligament attaches the ovaries to the lateral angle of the uterus?

<p>Ligament of ovary (B)</p> Signup and view all the answers

Where do the ovarian arteries originate from?

<p>Abdominal aorta (D)</p> Signup and view all the answers

What structure guides the released egg into the uterine tubes for fertilization?

<p>Fimbriae (B)</p> Signup and view all the answers

Which artery primarily supplies the uterus?

<p>Uterine artery (B)</p> Signup and view all the answers

What is the primary role of the round ligament in females?

<p>Connects the uterus to the abdominal wall (B)</p> Signup and view all the answers

Which hormone is primarily produced by the ovaries?

<p>Progesterone (B)</p> Signup and view all the answers

Which class of ligaments is primarily responsible for holding the uterus and ovaries in place?

<p>Broad ligament and derivatives (B)</p> Signup and view all the answers

What happens to the surface of the ovary after eggs are ovulated?

<p>It forms a scar (A)</p> Signup and view all the answers

What is the role of the mesovarium in the female reproductive system?

<p>Supports and stabilizes the ovary (B)</p> Signup and view all the answers

What is the primary function of the uterine tubes?

<p>Transport ova from the ovaries to the uterus (C)</p> Signup and view all the answers

Which of the following hormones is primarily involved in the regulation of the menstrual cycle?

<p>Progesterone (D)</p> Signup and view all the answers

What ligaments provide support to the uterus?

<p>Round ligament and broad ligament (A)</p> Signup and view all the answers

Where does fertilization of an ovum most commonly occur?

<p>Uterine tubes (A)</p> Signup and view all the answers

What is the primary role of ovaries in the female reproductive system?

<p>Produce ova and hormones (D)</p> Signup and view all the answers

Which nerve carries visceral afferent fibers related to pain in the reproductive tract?

<p>Pelvic splanchnic nerves (B)</p> Signup and view all the answers

What type of fibers innervate the smooth muscles of the reproductive tract?

<p>Sympathetic fibers from T10-L2 (C)</p> Signup and view all the answers

What is the role of the uterine tubes in female reproductive anatomy?

<p>They transport eggs from the ovaries to the uterus. (B)</p> Signup and view all the answers

Which lymph nodes drain the body of the uterus?

<p>External iliac nodes (D)</p> Signup and view all the answers

During fertilization, where does the sperm typically meet the egg?

<p>In the ampulla of the uterine tube. (A)</p> Signup and view all the answers

What is the role of the deep perineal nerve in the context of the vagina?

<p>Provide touch and temperature sensation to the inferior vagina (C)</p> Signup and view all the answers

Which hormone is primarily responsible for regulating the menstrual cycle?

<p>Estrogen (A)</p> Signup and view all the answers

What type of fibers do the pelvic splanchnic nerves carry?

<p>Parasympathetic motor fibers (C)</p> Signup and view all the answers

What is the function of the round ligament of the uterus?

<p>To maintain the anteverted position of the uterus. (B)</p> Signup and view all the answers

What layer of the uterus is primarily responsible for its contractions during childbirth?

<p>Myometrium (B)</p> Signup and view all the answers

Which hormone is responsible for preparing the endometrium for implantation of a blastocyst?

<p>Progesterone (B)</p> Signup and view all the answers

Where does the fertilized egg implant within the female reproductive system?

<p>In the endometrium of the uterus. (C)</p> Signup and view all the answers

Which of the following is NOT a structure associated with the uterine tubes?

<p>Cervix (D)</p> Signup and view all the answers

What is the main role of estrogen in the female reproductive system?

<p>Facilitating the development of secondary sexual characteristics. (D)</p> Signup and view all the answers

Which part of the uterine tube is the site where fertilization typically occurs?

<p>Ampulla (B)</p> Signup and view all the answers

What is the primary function of the fimbriae found on the infundibulum of the uterine tubes?

<p>To capture the oocyte during ovulation (D)</p> Signup and view all the answers

Which ligament is a remnant of the gubernaculum and helps support the ovary?

<p>Suspensory ligament of ovary (C)</p> Signup and view all the answers

What is the primary anatomical structure that covers the uterus, uterine tubes, and ovaries?

<p>Broad ligament (A)</p> Signup and view all the answers

Which portion of the uterine tubes extends from the superior end of the uterus to the lateral pelvic wall?

<p>Infundibulum (B)</p> Signup and view all the answers

Which of the following ligaments contains smooth muscle and may contain endopelvic fascia?

<p>Uterosacral ligament (D)</p> Signup and view all the answers

Which part of the uterine tube is primarily involved in the passage of the ovum into the uterine cavity?

<p>Uterine part (A)</p> Signup and view all the answers

What is the relationship between the ovarian ligament and the uterus?

<p>It connects the ovary to the uterus (D)</p> Signup and view all the answers

Which of the following structures is NOT part of the female external genitalia?

<p>Endometrial lining (C)</p> Signup and view all the answers

What is the primary function of the clitoris in the female external genitalia?

<p>To provide sensory pleasure (C)</p> Signup and view all the answers

Which term best describes the spectrum that includes biological sex variations?

<p>Continuum (B)</p> Signup and view all the answers

What are the major components of the nerve supply for the female external genitalia?

<p>Lumbar Plexus and Sacral Plexus (B)</p> Signup and view all the answers

What is one significant social implication of differentiating sex from gender?

<p>It helps in understanding gender roles (A)</p> Signup and view all the answers

Which of the following correctly describes intersex variations?

<p>They are considered to be a form of natural variation (C)</p> Signup and view all the answers

Which part of the female external genitalia serves as a vestibule for the vagina?

<p>Vestibulum of the vagina (C)</p> Signup and view all the answers

What term refers to the biological features that often characterize being male or female?

<p>Biological sex (A)</p> Signup and view all the answers

Which of the following best illustrates a misconception about gender identity?

<p>Gender is solely based on anatomical features. (A)</p> Signup and view all the answers

Which glands are part of the female external genitalia and contribute to lubrication?

<p>Greater vestibular glands (C)</p> Signup and view all the answers

What is the primary anatomical structure located anterior to the pubic symphysis?

<p>Mons pubis (B)</p> Signup and view all the answers

Which part of the vulva contains hairless skin and surrounds the vestibule?

<p>Labia minora (C)</p> Signup and view all the answers

Which structure is primarily responsible for sexual arousal among the external genitalia?

<p>Clitoris (B)</p> Signup and view all the answers

What is the term used to describe the area between the labia majora?

<p>Pudendal cleft (C)</p> Signup and view all the answers

Which glands are located on the medial aspects of the labia minora and secrete mucus?

<p>Greater vestibular glands (B)</p> Signup and view all the answers

What mental association does the term 'pudendum' have with its Latin root?

<p>To be ashamed (D)</p> Signup and view all the answers

Which structure may cover the vaginal orifice and can rupture during sexual intercourse?

<p>Hymen (D)</p> Signup and view all the answers

How are the bulbs of the vestibule related to the overall anatomy of the external genitalia?

<p>They provide support to the urethra and vagina. (D)</p> Signup and view all the answers

Which part of the female external genitalia is the most innervated and has a dense supply of sensory endings?

<p>Glans of the clitoris (B)</p> Signup and view all the answers

What change occurs to the posterior commissure after childbirth?

<p>It disappears. (B)</p> Signup and view all the answers

What tissue is homologous with the bulb of the penis?

<p>Bulbs of vestibule (D)</p> Signup and view all the answers

Which glands are located posterolateral to the vaginal orifice and secrete mucus during sexual arousal?

<p>Bartholin glands (B), Greater vestibular glands (C)</p> Signup and view all the answers

Which nerve primarily supplies sensation to the external genitalia?

<p>Pudendal nerve (A)</p> Signup and view all the answers

What artery serves as the main arterial supply to the external genitalia?

<p>Internal pudendal artery (C)</p> Signup and view all the answers

Which structure connects the anterior ends of the bulbs of the vestibule to the glans clitoris?

<p>Bulbospongiosus muscle (D)</p> Signup and view all the answers

Which nerve provides motor innervation to most of the muscles of the perineum?

<p>Perineal nerve (C)</p> Signup and view all the answers

Which of the following statements is true regarding the pudendal canal?

<p>It houses the internal pudendal artery and vein. (C)</p> Signup and view all the answers

What role do the greater vestibular glands primarily play?

<p>Secreting mucous during sexual arousal (A)</p> Signup and view all the answers

Which component is responsible for the sensory innervation of the clitoris?

<p>Dorsal nerve of the clitoris (D)</p> Signup and view all the answers

What significance do the bulbs of vestibule have in the anatomy of female external genitalia?

<p>They are involved in sexual arousal (A)</p> Signup and view all the answers

What structure joins the duct of the seminal vesicle to form the ejaculatory duct?

<p>Vas deferens (B)</p> Signup and view all the answers

Which layer is the dartos fascia continuous with in terms of anatomical structure?

<p>Scarpa's fascia (B)</p> Signup and view all the answers

Where do the ejaculatory ducts open in the male reproductive system?

<p>Seminal colliculus (C)</p> Signup and view all the answers

Which of the following is NOT a component of the spermatic cord?

<p>Testicular lymph nodes (A)</p> Signup and view all the answers

What is the primary function of the alkaline fluid produced by the seminal vesicles?

<p>To neutralize acidity (A)</p> Signup and view all the answers

Which artery is primarily responsible for the blood supply to the testes?

<p>Testicular artery (C)</p> Signup and view all the answers

How is the scrotum divided in terms of anatomical compartments?

<p>By the septum derived from dartos fascia (D)</p> Signup and view all the answers

Which of the following nerves provides autonomic innervation to the testes?

<p>Hypogastric nerve (B)</p> Signup and view all the answers

What anatomical structure is located posterior to the prostate and separates it from the rectum?

<p>Rectovesical pouch (C)</p> Signup and view all the answers

Which structure is responsible for transporting sperm from the epididymis to the ejaculatory duct?

<p>Ductus deferens (D)</p> Signup and view all the answers

What is the primary function of the spermatic cord?

<p>Provide blood and nerve supply to the testes (B)</p> Signup and view all the answers

Which structure is responsible for the storage and maturation of sperm?

<p>Epididymis (B)</p> Signup and view all the answers

What is the blood supply primarily responsible for delivering nutrients to the testes?

<p>Testicular artery (B)</p> Signup and view all the answers

Which nerve is primarily responsible for the sensory and autonomic innervation of the testes?

<p>Genitofemoral nerve (C)</p> Signup and view all the answers

Which of the following comprises the layers covering the spermatic cord?

<p>Skin, dartos fascia, external spermatic fascia (A)</p> Signup and view all the answers

What is the role of the vas deferens in the male reproductive system?

<p>It transports sperm from the epididymis to the ejaculatory duct (D)</p> Signup and view all the answers

Which gland provides lubrication for the urethra and is located near the base of the penis?

<p>Bulbo-urethral gland (D)</p> Signup and view all the answers

What is the anatomical location of the testes?

<p>Within the scrotum (C)</p> Signup and view all the answers

What physiological process occurs in the seminiferous tubules of the testes?

<p>Spermatogenesis (B)</p> Signup and view all the answers

What separates the scrotum from the abdominal cavity?

<p>Peritoneum (B)</p> Signup and view all the answers

Which structure is responsible for the production of sperm in the testes?

<p>Seminiferous tubules (C)</p> Signup and view all the answers

What is the primary blood supply to the testes?

<p>Testicular artery (B)</p> Signup and view all the answers

Which layer covers the testes and allows movement within the scrotum?

<p>Tunica vaginalis (B)</p> Signup and view all the answers

Which part of the male reproductive system connects the testes to the epididymis?

<p>Efferent ductules (B)</p> Signup and view all the answers

What is the main function of the epididymis?

<p>Storage and maturation of sperm (D)</p> Signup and view all the answers

What is the tunica albuginea primarily made of?

<p>Dense connective tissue (D)</p> Signup and view all the answers

Which structure is NOT considered an internal genital organ in males?

<p>Scrotum (A)</p> Signup and view all the answers

What hormone is primarily produced by the testes?

<p>Testosterone (B)</p> Signup and view all the answers

Which accessory gland contributes to the composition of seminal fluid?

<p>Seminal glands (B)</p> Signup and view all the answers

Which structure does the ductus deferens connect to?

<p>Prostate gland (C)</p> Signup and view all the answers

What is the primary function of the pampiniform plexus in the spermatic cord?

<p>To regulate blood flow for thermoregulation of the testis (C)</p> Signup and view all the answers

Which artery directly supplies blood to the testes?

<p>Testicular artery (D)</p> Signup and view all the answers

What is the role of the ductus deferens in male reproductive anatomy?

<p>To transport sperm to the ejaculatory duct (A)</p> Signup and view all the answers

Which type of fibers are found in the testicular plexus of nerves?

<p>Visceral afferent and parasympathetic fibers (B)</p> Signup and view all the answers

What structure does the tail of the epididymis continue as?

<p>Ductus deferens (D)</p> Signup and view all the answers

Where does the left testicular vein drain?

<p>Left renal vein (B)</p> Signup and view all the answers

How many efferent ductules connect to the head of the epididymis?

<p>12-14 (B)</p> Signup and view all the answers

Which anatomical feature helps maintain the optimal temperature for spermatogenesis?

<p>Pampiniform plexus (A)</p> Signup and view all the answers

What is the function of the ampulla in the ductus deferens?

<p>To store sperm temporarily (B)</p> Signup and view all the answers

Which structure is located on the posterior surface of the testis?

<p>Epididymis (B)</p> Signup and view all the answers

Which artery supplies the corpus spongiosum and spongy urethra?

<p>Dorsal artery of penis (D)</p> Signup and view all the answers

What is the primary function of the deep dorsal vein?

<p>Drains blood from cavernous spaces (D)</p> Signup and view all the answers

What type of nervous supply is primarily responsible for erection?

<p>Parasympathetic nerves (D)</p> Signup and view all the answers

Which lymph nodes drain the skin of the penis?

<p>Superficial inguinal nodes (B)</p> Signup and view all the answers

Which muscles assist in compressing veins during an erection?

<p>Bulbospongiosus and ischiocavernosus (C)</p> Signup and view all the answers

What is the role of cavernous nerves in penile blood flow?

<p>Relax smooth muscle to increase blood flow (D)</p> Signup and view all the answers

The deep artery of the penis primarily serves which part?

<p>Corpora cavernosa (A)</p> Signup and view all the answers

Which structure serves as a major drainage point for erectile tissue?

<p>Deep dorsal vein (B)</p> Signup and view all the answers

From which spinal segments do the primary nerves supplying the penis originate?

<p>S2, S3, S4 (D)</p> Signup and view all the answers

The artery of the bulb of the penis supplies which of the following?

<p>Bulb of corpus spongiosum (D)</p> Signup and view all the answers

What structure prevents the backward flow of semen into the bladder?

<p>Seminal colliculus (D)</p> Signup and view all the answers

Which part of the penis serves as the main erectile tissue responsible for erection?

<p>Corpora cavernosa (C)</p> Signup and view all the answers

What is the primary arterial supply to the penis?

<p>Internal pudendal artery (C)</p> Signup and view all the answers

Which nerve is responsible for stimulating secretion from the prostate during ejaculation?

<p>Pelvic splanchnic nerves (D)</p> Signup and view all the answers

Which structure is found ventrally in the penis and contains the urethra?

<p>Corpus spongiosum (D)</p> Signup and view all the answers

The prostatic utricle in males is considered an embryological remnant of which structure?

<p>Uterovaginal canal (C)</p> Signup and view all the answers

Which plexus is responsible for draining lymph from the prostate gland?

<p>Internal iliac nodes (C)</p> Signup and view all the answers

What is the primary function of the suspensory ligament of the penis?

<p>Anchor erectile bodies to the pubic symphysis (A)</p> Signup and view all the answers

What is the main function of the cavernous nerves supplied to the erectile tissues?

<p>Induce erection (A)</p> Signup and view all the answers

Which of the following correctly describes the role of the fundiform ligament?

<p>Suspends the penis from the pubic symphysis (D)</p> Signup and view all the answers

The ducts that open into the prostatic sinuses allow for the passage of which fluid?

<p>Prostatic fluid (B)</p> Signup and view all the answers

What type of tissue surrounds each erectile body of the penis?

<p>Fibrous covering (A)</p> Signup and view all the answers

What structure in the penis serves as a common outlet for both urine and semen?

<p>Urethra (A)</p> Signup and view all the answers

Which structure is responsible for the double-layered covering of the glans penis?

<p>Prepuce (foreskin) (C)</p> Signup and view all the answers

Which component of the penis is responsible for its rigidity during erection?

<p>Corpora cavernosa (B)</p> Signup and view all the answers

The inferior vesical artery is primarily responsible for supplying blood to which area?

<p>Bladder (B)</p> Signup and view all the answers

Where are the crura of the penis attached?

<p>To the ischial ramus (A)</p> Signup and view all the answers

Which structure is primarily responsible for the rigidity of the penis during erection?

<p>Tunica albuginea (B)</p> Signup and view all the answers

What type of erectile tissue is primarily found in the penis?

<p>Cavernous erectile tissue (A)</p> Signup and view all the answers

Which fascial layer ties the penis's erectile bodies together?

<p>Deep fascia of the penis (C)</p> Signup and view all the answers

Which urethral feature is located at the tip of the glans penis?

<p>Meatus (C)</p> Signup and view all the answers

Which of the following ligaments connects the penis to the pubic symphysis?

<p>Suspensory ligament of the penis (D)</p> Signup and view all the answers

What is the primary tissue composition of the penis?

<p>Erectile, connective, and fascia (A)</p> Signup and view all the answers

What role does the bulbourethral gland play in male reproductive anatomy?

<p>Secretes pre-ejaculatory fluid (A)</p> Signup and view all the answers

Which nerve is primarily involved in the erectile response?

<p>Pelvic splanchnic nerves (D)</p> Signup and view all the answers

Which lymphatic drainage route does the penis primarily utilize?

<p>Superficial inguinal lymph nodes (D)</p> Signup and view all the answers

Which component surrounds and protects the erectile tissues of the penis?

<p>Tunica albuginea (A)</p> Signup and view all the answers

Which artery branches off to supply the glans penis specifically?

<p>Dorsal artery of the penis (B)</p> Signup and view all the answers

What is the function of the corpus spongiosum?

<p>To house the urethra (A)</p> Signup and view all the answers

What is a primary function of the perineum in the human body?

<p>Provide structural support for pelvic organs (B)</p> Signup and view all the answers

Which muscles primarily compose the pelvic diaphragm?

<p>Levator ani and coccygeus (C)</p> Signup and view all the answers

How does the pelvic diaphragm contribute to pelvic support?

<p>By resisting intra-abdominal pressure during straining (B)</p> Signup and view all the answers

What nerve primarily supplies the pelvic diaphragm?

<p>Pudendal nerve (C)</p> Signup and view all the answers

Which pathology is commonly associated with pelvic floor disorders?

<p>Urinary incontinence (B)</p> Signup and view all the answers

What structure provides a boundary to the perineum?

<p>Pubic bone and coccyx (C)</p> Signup and view all the answers

Which of the following describes the anal triangle of the perineum?

<p>Bounded by the ischial tuberosities and the coccyx (C)</p> Signup and view all the answers

What is the primary role of the muscles forming the pelvic diaphragm?

<p>Support the pelvic viscera (D)</p> Signup and view all the answers

Which of the following statements is correct regarding pelvic floor disorders?

<p>They can manifest in both men and women (C)</p> Signup and view all the answers

What contributes to the stabilization of the pelvic cavity during physical activity?

<p>Ligaments and pelvic diaphragm muscles (A)</p> Signup and view all the answers

What is the primary function of the pelvic diaphragm?

<p>Support pelvic viscera (C)</p> Signup and view all the answers

Which of the following muscles is part of the levator ani complex?

<p>Pubococcygeus (B)</p> Signup and view all the answers

What anatomical feature allows for the passage of the urethra and vagina in females?

<p>Urogenital hiatus (C)</p> Signup and view all the answers

How does the puborectalis muscle contribute to continence?

<p>By maintaining the perineal flexure (B)</p> Signup and view all the answers

The coccygeus muscle is primarily involved in which function?

<p>Support of pelvic organs (A)</p> Signup and view all the answers

Which component of the pelvic diaphragm forms a sling around the rectum?

<p>Puborectalis (D)</p> Signup and view all the answers

What is a common consequence of weakness in the pelvic diaphragm?

<p>Urinary incontinence (D)</p> Signup and view all the answers

Which muscle is primarily responsible for lateral pelvic wall coverage?

<p>Obturator internus (D)</p> Signup and view all the answers

Which nerve primarily innervates the pelvic floor muscles?

<p>Pudendal nerve (A)</p> Signup and view all the answers

What role does the tendinous arch play in the pelvic diaphragm?

<p>Serves as an attachment point for pelvic diaphragm muscles (D)</p> Signup and view all the answers

What is the primary function of the perineal muscles in both sexes?

<p>Assisting in urination (D)</p> Signup and view all the answers

Which muscle is primarily involved in compressing the bulb of the penis during ejaculation?

<p>Bulbospongiosus (B)</p> Signup and view all the answers

What nerve supplies the levator ani muscle?

<p>Nerve to levator ani (S4) (C)</p> Signup and view all the answers

Which condition may arise from dysfunction of the pelvic floor muscles?

<p>Urinary incontinence (C)</p> Signup and view all the answers

The perineal membrane is primarily responsible for dividing which anatomical space?

<p>Deep and superficial perineal spaces (A)</p> Signup and view all the answers

What structure lies posterior to the vaginal vestibule in females?

<p>Perineal body (A)</p> Signup and view all the answers

Which part of the pelvic diaphragm closes the posterior part of the pelvic outlet?

<p>Pelvic diaphragm (C)</p> Signup and view all the answers

What is the role of the superficial perineal space in both sexes?

<p>Containing external genitalia and associated muscles (B)</p> Signup and view all the answers

Which of the following statements is true regarding the urogenital hiatus?

<p>It's a U-shaped defect in levator ani muscles. (C)</p> Signup and view all the answers

Which structure is not a component of the anal triangle?

<p>Ischiocavernosus (C)</p> Signup and view all the answers

Flashcards

Abdominal Aorta Location

Starts at T12 (thoracic vertebra 12), passing through the aortic hiatus of the diaphragm, and ends at L4 (lumbar vertebra 4) where it bifurcates into common iliac arteries.

Abdominal Aorta Branches

The abdominal aorta has three major planes of branches: unpaired visceral (middle), paired visceral (sides), and parietal branches (posterior).

Unpaired Visceral Branches

Branches supplying the digestive system, including the celiac trunk, superior mesenteric artery, and inferior mesenteric artery.

Paired Visceral Branches

Branches supplying the urogenital and endocrine organs, such as the suprarenal, renal, and gonadal arteries.

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Median Sacral Artery

A parietal (posterior) branch of the abdominal aorta supplying the sacrum.

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Common Iliac Arteries

The final branches of the abdominal aorta, dividing into external and internal iliac arteries.

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Sympathetic Trunk and Ganglia

The sympathetic chain of ganglia and nerves that supply the abdominal and pelvic viscera.

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Splanchnic Nerves

Nerves carrying sympathetic and parasympathetic signals, regulating abdominal and pelvic viscera.

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Inferior Vena Cava

A large vein that carries deoxygenated blood from the lower body to the heart.

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Inferior Vena Cava Tributaries

Blood vessels that drain into the Inferior Vena Cava, corresponding to paired visceral and parietal branches of the abdominal aorta.

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Hepatic Portal Vein

The vein that carries nutrient-rich blood from the digestive organs to the liver.

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Aortic Lymphatic Nodes

Groups of lymph nodes located along the aorta that collect lymph from abdominal organs.

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Lymphatic Trunks

Larger vessels that collect lymph from lymph nodes, before emptying into major veins.

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Thoracic Duct

Main lymphatic vessel collecting lymph from the lower body and left side of the upper body.

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Cisterna Chyli

An enlarged part of the thoracic duct, located anterior to the lumbar vertebrae.

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Lumbar Lymph Nodes

Lymph nodes in the lumbar region of the body, collecting lymph from the lower extremities and abdominal structures.

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Aortic Hiatus

An opening in the diaphragm that allows the aorta to pass through.

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Pre-aortic Lymph Nodes

Lymph nodes positioned in front of abdominal aorta, filtering lymph from digestive organs.

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Lumbar Plexus

A network of nerves formed by the anterior rami of spinal nerves L1-L4, located anterior to the lumbar transverse processes, within the attachment of the psoas major muscle.

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Subcostal Nerve

A nerve that arises from the T12 spinal nerve, passes through the thorax and contributes to the innervation of the abdominal wall and skin.

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Ilio-hypogastric Nerve

A nerve branching from the L1 spinal nerve, traveling along the abdominal wall, supplying innervation to the abdominal muscles and skin of the lower abdomen and gluteal region.

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Ilio-inguinal Nerve

A nerve originating from L1, passing through the abdominal wall and inguinal canal, supplying innervation to the inner oblique and transversus abdominis muscles, skin of the medial thigh and genital region.

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Lumbar Plexus Nerves

The nerves of the lumbar plexus, like subcostal, ilio-hypogastric, and ilio-inguinal, provide motor and sensory innervation to the lower abdomen, hip, and parts of the lower limb.

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Lumbar Vertebrae

Five vertebrae in the lower back, with large, kidney-shaped bodies for weight-bearing. They have short, horizontal spinous processes and facets that allow flexion, extension, and lateral bending.

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Sacrum

Five fused vertebrae forming the back of the pelvis, triangular with the apex pointing downward. It articulates with the coccyx and the fifth lumbar vertebra (L5).

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Psoas Major: Origin

The psoas major originates from the transverse processes and bodies of the lumbar vertebrae, as well as the T12 vertebra.

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Psoas Major: Action

Flexes the thigh at the hip joint.

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Quadratus Lumborum: Action

Depresses and stabilizes the 12th rib, and laterally flexes the trunk.

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Iliacus: Origin & Insertion

Originates from the iliac fossa and inserts on the lesser trochanter of the femur.

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Diaphragm: Attachments

Sternal, costal, and lumbar attachments, forming a dome-shaped structure.

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Diaphragm: Openings

Three openings: caval opening (T8), esophageal hiatus (T10), and aortic hiatus (T12).

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Diaphragm: Nerve Supply

Phrenic nerve, originating from cervical spinal nerves C3, C4, and C5.

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Retroperitoneal Space

The space behind the peritoneum, containing organs and structures that are not directly covered by peritoneum on both sides.

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Retroperitoneal Structures

Organs like kidneys, pancreas, and aorta that have peritoneum only on their anterior surface.

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Psoas Fascia

A sheath of connective tissue covering the psoas major muscle, forming a medial arcuate ligament that helps anchor the diaphragm.

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Quadratus Lumborum Fascia

A fascia layer covering the quadratus lumborum muscle, forming a lateral arcuate ligament and contributing to the thoracolumbar fascia.

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Structures on Posterior Abdominal Wall

Includes nerves (lumbar plexus, sympathetic), arteries (abdominal aorta, branches), and veins (inferior vena cava, tributaries).

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Lymphatic Drainage

Lymph vessels draining fluids and waste from the abdomen, passing through lymph nodes and eventually entering the thoracic duct.

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Sympathetic Nerves

Nerves carrying signals that regulate involuntary functions like digestion, blood pressure, and sweating.

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Posterior Abdominal Wall Bony Components

The bony components of the posterior abdominal wall are the lumbar vertebrae (L1-L5), the sacrum, and the iliac bones.

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Posterior Abdominal Wall Muscles: Psoas Major

The psoas major muscle originates from the lumbar vertebrae (T12-L5) and inserts on the lesser trochanter of the femur. It flexes the thigh at the hip joint and helps with lateral flexion of the trunk.

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Posterior Abdominal Wall Muscles: Quadratus Lumborum

The quadratus lumborum muscle originates from the iliac crest and inserts on the 12th rib. It helps to extend and laterally flex the trunk, and stabilize the rib cage.

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Posterior Abdominal Wall Muscles: Iliacus

The iliacus muscle originates from the iliac fossa and inserts on the lesser trochanter of the femur. It works with the psoas major to flex the thigh at the hip.

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Structures on the Posterior Abdominal Wall

The structures on the posterior abdominal wall include the abdominal aorta, inferior vena cava, lumbar plexus, sympathetic trunk, lumbar lymph nodes, and the retroperitoneal space.

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Iliacus Action

It flexes the thigh at the hip joint, working together with the psoas major muscle.

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What is the Retroperitoneal Space?

The space behind the peritoneum, containing organs and structures that aren't covered by peritoneum on both sides.

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What are Retroperitoneal Structures?

Organs like kidneys, pancreas, and the aorta that have peritoneum only on their anterior (front) surface.

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Abdominal Aorta

The main artery supplying blood to the abdomen, branching out to various organs.

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Genitofemoral nerve - Where does it pass?

The genitofemoral nerve pierces the psoas major muscle and courses on the anterior surface of the muscle.

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Genitofemoral nerve - What does it innervate?

The genitofemoral nerve branches into genital and femoral branches. The genital branch innervates the cremaster muscle and skin of the external genitalia. The femoral branch supplies the superior part of the femoral triangle and parts of the fascia lata.

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Lateral cutaneous nerve of thigh - Location?

The lateral cutaneous nerve of the thigh originates from the posterior border of the psoas major and runs under the inguinal ligament, medial to the anterior superior iliac spine (ASIS).

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Femoral nerve - What does it innervate?

The femoral nerve innervates the iliacus and flexor muscles of the hip joint, as well as the extensor muscles of the knee.

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Obturator nerve - Where does it pass?

The obturator nerve exits the pelvis through the obturator foramen to reach the medial thigh.

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Lumbar Plexus Function

The Lumbar Plexus is responsible for motor and sensory innervation to the lower abdomen, hip, and portions of the lower limb.

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Psoas Major: Origin & Function

Originates from the lumbar vertebrae, flexes the thigh at the hip, assists in lateral flexion of the trunk.

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Iliacus: Origin & Function

Originates from the iliac fossa, inserts on the femur, flexes the thigh at the hip, works with psoas major.

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Kidney Location

The kidneys are located in the retroperitoneal space, between the levels of thoracic vertebra 12 (T12) and lumbar vertebra 3 (L3).

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Kidney Movements

The kidneys move slightly during respiration, about 2-3 centimeters, and also shift with changes in posture.

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Hilum of Left Kidney

The hilum of the left kidney is located anteriorly, facing the psoas major muscle.

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Kidney Coverings

The kidneys are encased in three layers: the renal fascia, the perirenal fat capsule, and the fibrous capsule.

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Kidney's Blood Supply

The kidneys receive blood from the renal arteries, which branch directly from the abdominal aorta.

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Kidney's Nerve Supply

The kidneys are innervated by the renal plexus, which carries both sympathetic and parasympathetic nerves.

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Lymphatic Drainage of Kidneys

The lymphatic vessels drain from the kidneys to the lumbar lymph nodes, which are located in the abdominal cavity.

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Urinary System Components

The urinary system consists of two kidneys, two ureters, one urinary bladder, and one urethra.

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Ureter Function

The ureters transport urine from the kidneys to the urinary bladder.

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Urethra Function

The urethra transports urine from the urinary bladder to the outside of the body.

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Transpyloric Plane

The transpyloric plane is an imaginary line that passes through the pylorus of the stomach, the superior pole of the right kidney, and the L1 vertebra. It serves as a reference point for locating various organs and structures in the abdomen.

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Renal Capsule

The renal capsule is a fibrous membrane that surrounds each kidney, providing a protective covering and maintaining its shape.

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Perinephric Fat

Perinephric fat is a layer of adipose tissue that surrounds the kidney and its vessels. It provides cushioning and insulation.

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Renal Fascia

The renal fascia is a dense connective tissue sheath that encloses the kidney, suprarenal gland, and perinephric fat. It helps to fix the kidney in place and anchors it to surrounding structures.

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Renal Sinus

The renal sinus is a hollow cavity within the kidney that contains the renal pelvis, calyces, blood vessels, nerves, and fat.

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Renal Cortex

The renal cortex is the outer layer of the kidney, which extends into the medulla between the pyramids as renal columns. It contains the glomeruli and proximal and distal convoluted tubules.

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Renal Medulla

The renal medulla is the inner layer of the kidney, comprised of renal pyramids, which are cone-shaped structures that extend from the apex (papilla) into the minor calyx.

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Renal Pelvis

The renal pelvis is a funnel-shaped structure that collects urine from the major calyces and connects to the ureter.

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Kidney Relations

The kidneys are related to various structures. Anteriorly, they are related to the liver, duodenum, jejunum, and spleen. Posteriorly, they are related to the diaphragm, psoas major muscle, quadratus lumborum muscle, and transversus abdominis muscle.

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Kidney Venous Drainage

The kidneys are drained by the renal veins, which empty into the inferior vena cava. The left renal vein is longer and crosses the midline, passing anterior (in front) to the abdominal aorta.

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Kidney Lymphatic Drainage

The lymphatic drainage of the kidneys is towards the lateral aortic (lumbar) nodes located near the origin of the renal artery.

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Kidney Innervation

The kidneys receive sympathetic innervation from the least splanchnic nerve (T12) and sometimes the first lumbar nerve (L1). Parasympathetic innervation comes from the vagus nerve.

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Kidney Surface Anatomy

The kidneys have a smooth outer surface known as the renal capsule. The medial side has a concave indentation called the hilum, where blood vessels, nerves, and the ureter enter and exit.

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Kidney Structure

The kidney is divided into an outer cortex and inner medulla. The medulla contains the renal pyramids, which are cone-shaped structures that drain urine into the renal pelvis.

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Kidney Function

The kidneys are responsible for filtering waste products from the blood, maintaining electrolyte balance, regulating blood pressure, and producing hormones.

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Ureters: Course

The ureters are muscular tubes that carry urine from the kidneys to the bladder. They have a retroperitoneal course, meaning they are behind the peritoneum. The abdominal part runs inferiorly from the renal pelvis, crosses the brim of the pelvis, and the pelvic part runs along the lateral wall of the pelvis before entering the bladder at the upper corners.

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Ureters: Constrictions

The ureters have three constrictions along their course: 1) at the junction of the ureter and renal pelvis, 2) where the ureter crosses the brim of the pelvis, and 3) during passage through the bladder wall.

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Structures crossing ureters

The ureters are crossed by blood vessels during their course. In males, the testicular artery crosses anteriorly in the abdominal part, and the ductus deferens crosses in the pelvic part. In females, the ovarian artery crosses anteriorly in the abdominal part.

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Ureters: Blood supply

The ureters receive blood supply from various arteries throughout their course. The abdominal part mainly receives blood from the renal artery, while the pelvic part receives blood from the common iliac, internal iliac, and gonadal arteries.

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Urinary bladder: Location

The urinary bladder is located in the pelvic cavity, just behind the pubic symphysis (the joint between the left and right pubic bones) .

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Urinary bladder: Shape and structure

The urinary bladder is a hollow, muscular organ that expands to store urine. It is made up of three layers: the inner mucosa lining, the middle muscular layer, and the outer serosa covering.

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Urethra: Course (Male & Female)

The urethra is a tube that carries urine from the bladder out of the body. In males, the urethra is longer and passes through the prostate gland and penis. In females, it is shorter and opens into the vulva.

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Pubovesical Ligaments

Fibromuscular bands that anchor the urinary bladder to the pubis in females.

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Puboprostatic Ligaments

Fibromuscular bands that anchor the urinary bladder to the pubis in males.

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Seminal Glands

Paired glands in males that contribute to seminal fluid.

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Vesico-uterine Space

Space between the urinary bladder and the uterus in females.

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Retropubic Space

Space behind the pubic bone, containing fat and connective tissue.

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Vesical Venous Plexus

Network of veins draining the urinary bladder.

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Prostatic Plexus

Part of the vesical venous plexus that drains the prostate and penis in males.

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Detrusor Muscle

The main muscle of the urinary bladder, responsible for bladder contraction.

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Internal Urethral Sphincter

Muscle that controls the release of urine from the bladder.

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Sympathetic Innervation of Bladder

Nerves that inhibit bladder contraction and cause relaxation of the internal urethral sphincter.

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Ureters: Nerve Supply

Receive nerve supply from the renal plexus, which includes contributions from the abdominal aortic plexus, superior and inferior hypogastric plexuses. Pain sensation is relayed through visceral afferent fibers to spinal ganglia and cord regions T11-L2.

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Ureteric Pain Referral

Pain from the ureters is often referred to the lower quadrant of the anterior abdominal wall, including the groin. This is due to the shared nerve pathways.

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Urinary Bladder: Overview

A hollow, muscular, and distensible organ that serves as a temporary reservoir for urine. It's located in the pelvic cavity when empty and expands into the abdominal cavity when full.

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Urinary Bladder: Location in Adults

When empty, the bladder sits partially superior and posterior to the pubic bones (retropubic space). Its superior surface is level with the superior margin of the pubic symphysis. It lies above the pelvic floor and mostly within the lesser pelvis, inferior to the peritoneum. A full bladder extends into the greater pelvis.

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Urinary Bladder: Location in Infants and Children

In infants and young children, the bladder is located in the abdomen even when empty. It descends into the pelvic cavity around the age of 6.

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Urinary Bladder: Shape - Empty

An empty bladder is pyramid-shaped, with four surfaces: superior, posterior, and two inferolateral. It has an apex, base (fundus), body, and neck.

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Urinary Bladder: Parts - Apex

Pointing towards the top of the pubic symphysis, connected to the median umbilical ligament, which extends upwards to the umbilicus.

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Urinary Bladder: Parts - Base

Inverted triangle shape, pointing posteroinferiorly. It contains the openings of the ureters at the upper corners and the urethra at the lower corner. The trigone is a smooth, triangular area between the ureters and urethra.

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Urinary Bladder: Structure - Detrusor Muscle

The wall of the bladder is composed of smooth muscle, called the detrusor muscle. This muscle helps to expel urine and forms the internal urethral sphincter (only in males).

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Female Urethra Length

The female urethra is short, measuring approximately 4 centimeters (1.6 inches).

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Male Urethra Length

The male urethra is significantly longer than the female urethra, measuring approximately 20 centimeters (8 inches).

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Urethra: Function (Female)

In females, the urethra serves only as a passageway for urine.

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Urethra: Function (Male)

In males, the urethra serves a dual purpose: transporting urine and semen. However, these functions do not occur simultaneously.

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Skene's Glands

These are paraurethral mucous glands in females that open onto the lateral margin of the external urethral orifice.

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Male Urethra: Parts

The male urethra is divided into four parts: preprostatic, prostatic, membranous, and spongy.

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Prostatic Utricle

A blind-ended pouch that opens into the seminal colliculus within the prostatic part of the male urethra.

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Ejaculatory Duct

This duct conveys sperm from the testis into the urethra, opening on either side of the prostatic utricle.

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Navicular Fossa

This is an enlargement at the end of the spongy part of the male urethra, located within the glans penis.

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Internal Iliac Artery: Origin

The internal iliac artery arises from the common iliac artery, located near the end of the abdominal aorta. It branches out into the pelvic area.

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Internal Iliac Artery: Course

The internal iliac artery descends into the lesser pelvis, passing between the external iliac vein and the obturator nerve. It's situated close to the peritoneum, the lining of the abdominal cavity.

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Internal Iliac Artery: Distribution

This artery supplies blood to various structures in the pelvis, including the pelvic viscera (organs), pelvic walls and floor, perineum, and gluteal region.

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Internal Iliac Artery: Divisions

The internal iliac artery divides into anterior and posterior branches, each supplying specific areas of the pelvis.

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Umbilical Artery: Function

During fetal development, the umbilical arteries carry deoxygenated blood from the fetus to the placenta. After birth, they usually close off and become ligaments, except for a small part that remains open.

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Urogenital Ridges: Where do they form?

Urogenital ridges are formed from the intermediate mesoderm, which is a specialized tissue located along the developing body axis.

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What are the three stages of kidney development?

The kidney development occurs in three distinct stages: the pronephros, the mesonephros, and the metanephros.

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Pronephros: What's its fate?

The pronephros, the first kidney structure, forms in the cervical region but eventually regresses, meaning it disappears.

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Mesonephros: What's its role?

The mesonephros is a functional kidney in lower vertebrates but in humans, it serves as a temporary kidney and contributes to the development of the male reproductive system.

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Metanephros: What is it?

The metanephros is the definitive kidney, the one that will form the permanent kidneys in humans.

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What is the ureteric bud?

The ureteric bud is an outgrowth from the mesonephric duct, which will eventually form the ureter and the collecting system of the kidney.

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Collecting System: How is it formed?

The collecting system of the kidney, including the ureter, renal pelvis, and calyces, is formed from the ureteric bud.

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Excretory System: What's its role?

The excretory system is comprised of the nephrons in the kidney and filters waste products from the blood, creating urine.

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Urogenital Sinus: What does it form?

The urogenital sinus, formed from the cloaca, will develop into the bladder and the urethra.

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Bladder and Urethra: How are they formed?

The bladder forms from the urogenital sinus, while the urethra forms from its ventral (front) portion.

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Metanephros Function

The metanephros, which develops into the definitive kidney, becomes functional during the 10th week of embryogenesis.

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Fetal Urine Role

Fetal urine contributes to the amniotic fluid, which surrounds the fetus in the uterus.

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Kidney Vascularization

The relocating kidneys receive their blood supply from the dorsal aorta.

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Urogenital Sinus Function

The urogenital sinus, a structure derived from the cloaca, gives rise to the urinary bladder and urethra.

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Bladder Formation

The bladder forms from the urogenital sinus and may also partially develop from the lower portion of the allantois.

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Urethra Formation

The membranous and prostatic urethra in males, and the membranous urethra in females, develop from the urogenital sinus.

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Ureteric Ducts and Mesonephric Duct

The caudal ends of the ureteric ducts and the mesonephric duct fuse to form a common duct connecting to the posterior wall of the bladder.

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Common Duct Apoptosis

The apoptosis (programmed cell death) of the common duct brings ureter progenitors into contact with the urogenital sinus, allowing for further bladder development.

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Urinary System Development

The urinary system develops from the intermediate mesoderm, with three stages: pronephros, mesonephros, and metanephros.

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Mesonephric Tubules

Excretory units forming in the 4th week of embryonic development, located in the thoracic to lumbar region, adjacent to the mesonephric duct. They differentiate into Bowman's capsule and renal corpuscle.

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Mesonephric Duct

A tube that forms from the fusion of the lateral parts of the mesonephric tubules. It acts as a passage for urine from the mesonephros to the cloaca in early development.

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Metanephric Mesenchyme

Specialized tissue in the sacral region that interacts with the ureteric bud to form the definitive kidney (metanephros).

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Ureteric Bud

A bud that arises from the caudal end of the mesonephric duct, invading the metanephric mesenchyme. It branches and forms the collecting system of the kidney.

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Collecting System

The network of tubes in the kidney that collects urine from nephrons and transports it to the ureter. It forms from the branching of the ureteric bud.

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Nephron

The functional unit of the kidney, responsible for filtering blood and producing urine. It develops from the metanephric mesenchyme and interacts with the ureteric bud.

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Renal Vesicle

A structure derived from the metanephric mesenchyme that interacts with the ureteric bud during nephron formation. It eventually forms the uriniferous tubule.

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Uriniferous Tubule

The complete tubule of the nephron, formed from the renal vesicle and the ureteric stalk. It consists of the proximal convoluted tubule, loop of Henle, and distal convoluted tubule.

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Podocytes

Specialized cells that make up the visceral layer of Bowman's capsule in the kidney. They help to filter blood and form the filtration barrier.

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Nephrogenesis

The process of nephron formation, which begins in the early fetal period and continues until birth.

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Paramesonephric ducts - what do they form?

The paramesonephric ducts fuse caudally to cranially, creating the uterus and the uterine tubes. The cranial openings of the uterine tubes are called the infundibula.

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Vagina Development: What is the vaginal plate?

The vagina develops from an expansion of the sinusal tubercle, forming a solid block of endodermal tissue called the vaginal plate that lengthens and sheds cells to create a lumen.

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Genital Tubercle: What does it form?

The genital tubercle is a mesodermal swelling that forms the phallus, which will develop into the clitoris in females and the penis in males.

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Urogenital folds: What do they form?

Urogenital folds develop on either side of the urogenital plate and merge with the genital tubercle, forming the labia minora in females and the shaft of the penis in males.

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Labioscrotal swellings: What do they form?

Labioscrotal swellings appear on either side of the urogenital folds and develop into the labia majora in females and the scrotum in males.

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Urethral groove: What forms it and what does it become?

The urethral groove forms along the ventral surface of the urogenital plate as the genital tubercle elongates. It eventually develops into the urethra.

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Indifferent Stage: When are male and female genitalia similar?

Male and female genitalia are similar in structure and appearance until the end of week 12 of development. This is known as the indifferent stage.

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What is the hymen?

The hymen is a thin membrane that surrounds the opening of the vagina. It is a remnant of the endodermal membrane that separated the vaginal lumen from the urogenital sinus.

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Indifferent Genitalia

The early stage of development where the external genitalia of a fetus is not yet distinguishable as male or female.

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SRY Gene

A gene located on the Y chromosome that determines maleness. It triggers the production of the SRY protein.

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Primordial Follicles

The earliest stage of ovarian development where germ cells are surrounded by follicle cells.

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Paramesonephric Ducts

Ducts that develop into the female reproductive organs: uterine tubes, uterus, and upper part of the vagina.

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Androgen Insensitivity Syndrome

A condition where the body is unresponsive to testosterone, despite the presence of the SRY gene and normal testosterone levels, resulting in a female phenotype even with XY chromosomes.

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Genital Ridges

The paired structures that develop into the gonads (testes or ovaries) during fetal development.

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Somatic Support Cells

Cells that support the germ cells during gonad development, ultimately forming follicle cells around them.

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Ambisexual/Bipotential

The state of the fetus before sex differentiation occurs, where the potential for both male and female development exists.

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Inguinal Canal

A passageway through the abdominal wall, through which the testes descend into the scrotum.

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Gonadal Sex

Refers to the type of gonads present (testes or ovaries), determined by the presence or absence of the SRY gene.

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What happens to urethral folds during male external genitalia development?

The urethral folds grow towards each other and fuse in the midline, converting the urethral groove into a tubular penile urethra.

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What is the role of dihydrotestosterone in male external genitalia development?

Dihydrotestosterone causes the perineal region to lengthen, separating the urogenital sinus from the anus, and promotes the fusion of labioscrotal folds to form the scrotum.

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What happens to the labioscrotal folds in female external genitalia development?

In the absence of dihydrotestosterone, the labioscrotal folds do not fuse across the midline and become the labia majora.

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What forms the inguinal canal?

The inguinal canal is formed by an evagination of the peritoneum, called the vaginal process, pushing through the layers of the abdominal wall.

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What are the layers of the spermatic cord?

The spermatic cord consists of layers of abdominal wall structures: transversalis fascia, internal oblique, external oblique, each forming a fascia layer.

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What is the gubernaculum?

The gubernaculum is a ligament that extends from the caudal genito-inguinal ligament to the labioscrotal swellings, helping guide the descent of the testes.

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How does the inguinal canal relate to the descent of testes?

The inguinal canal serves as the passageway for the testes to descend from the abdomen into the scrotum.

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What is the role of the vaginal process in females?

The vaginal process in females is usually rudimentary and usually degenerates, unlike in males where it persists to allow for testicular descent.

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What is the function of the cranial suspensory ligament?

The cranial suspensory ligament anchors the mesonephric-gonadal complex to the diaphragm, providing support and stability.

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What are the superior and inferior rings of the inguinal canal?

The superior ring is the deep ring, located at the entrance of the inguinal canal; the inferior ring is the superficial ring, located at the exit of the inguinal canal.

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Gubernaculum

A fibrous cord that guides testes and ovaries during their descent from the abdomen.

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Testes Descent

The process of testes moving from the abdominal cavity to the scrotum, guided by the gubernaculum.

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Intra-abdominal Phase

The initial stage of testes descent where they move from their original position to the deep inguinal ring.

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Inguinoscrotal Phase

The second stage of testes descent where the testes pass through the inguinal canal towards the scrotum.

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Tunica Vaginalis

A serous membrane that surrounds the testes, derived from the cranial portion of the vaginal process.

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Ovary Descent

The process of ovaries moving from the abdominal cavity into the peritoneal fold, guided by the gubernaculum.

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Broad Ligament

A peritoneal fold that supports the ovaries, fallopian tubes, and uterus.

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Round Ligament of Uterus

A ligament formed from the gubernaculum that connects the uterus to the labia majora.

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Primordial Germ Cells

Stem cells that migrate from the yolk sac to the genital ridges, where they differentiate into either sperm or egg cells.

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Male Genital Duct Development

The process of the mesonephric ducts differentiating into the epididymis, vas deferens, and ejaculatory duct in response to testosterone. This occurs from weeks 8-12 in male fetal development.

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Accessory Gland Development

The development of seminal vesicles, prostate gland, and bulbourethral glands alongside the mesonephric ducts. These glands contribute to the production of seminal fluids.

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Female Genital Development

The process of the paramesonephric ducts differentiating into the uterine tube, uterus, and part of the vagina in the absence of SRY gene, testosterone, and AMH.

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Female Germ Cell Differentiation

Germ cells in females differentiate into oogonia, which then proliferate and transform into oocytes, entering the first meiotic division. These oocytes are surrounded by somatic support cells, forming primordial follicles.

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Mesosalpinx

The part of the broad ligament that covers the uterine tubes, providing support and attachment.

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Mesovarium

Part of the broad ligament that connects to the ovary, providing support and blood supply.

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Infundibulum (Uterine Tube)

Funnel-shaped distal end of the uterine tube, opening into the peritoneal cavity. Its fimbriae help capture the egg during ovulation.

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Ampulla (Uterine Tube)

The widest and longest part of the uterine tube, where fertilization typically occurs.

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Ovarian Ligament

A short, fibrous cord that attaches the ovary to the uterus, providing stability.

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Suspensory Ligament of Ovary

A fold of peritoneum that attaches the ovary to the pelvic wall, providing support and blood supply.

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Vaginal Fornix

A recess around the cervix, divided into 4 parts: anterior, posterior, and 2 lateral fornices.

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Uterus Position

The uterus is anteverted (tipped anterosuperiorly) and anteflexed (flexed anteriorly) and lies over the bladder.

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Uterine Fundus

The rounded superior part of the uterus above the uterine tubes.

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Uterine Myometrium

The middle smooth muscle layer of the uterus, which expands during pregnancy and contracts during birth.

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Uterine Endometrium

The inner mucous layer of the uterus that sheds during menstruation and where the fertilized egg implants.

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Cervix

The lower part of the uterus that connects to the vagina, divided into supravaginal and vaginal parts.

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Internal Os

The opening between the cervical canal and the uterine cavity.

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External Os

The opening between the cervical canal and the vaginal cavity.

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Vesicouterine Pouch

The space between the uterus and the bladder, formed by the peritoneum.

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Broad Ligament Parts

The broad ligament is a peritoneal fold that supports the uterus and its associated structures. It consists of three main parts:

  • Mesovarium: The part that attaches to the ovary.
  • Mesosalpinx: The part that attaches to the fallopian tube.
  • Mesometrium: the largest part, which attaches to the uterus.
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Ligament of Ovary

The ligament of ovary is a short, thick ligament that connects the uterine end of the ovary to the lateral angle of the uterus.

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Ovary Location

The ovaries are almond-shaped organs located between the uterus and the lateral pelvic walls, inferior to the pelvic inlet. They are attached by peritoneal folds and ligaments.

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Ovary Functions

The ovaries have two primary functions:

  • Reproductive function: Produce oocytes (immature egg cells), which are released during ovulation.
  • Endocrine function: Secrete hormones like estrogen and progesterone, which regulate the menstrual cycle and play a role in female development.
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Ovary Blood Supply

The ovaries receive blood supply from both the ovarian and uterine arteries. The ovarian arteries originate directly from the abdominal aorta and travel within the suspensory ligament.

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Uterine Blood Supply

The uterus is primarily supplied by the uterine arteries, which originate from the internal iliac artery. The ovarian arteries also contribute blood supply to the upper portion of the uterus.

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Pampiniform Plexus

The pampiniform plexus is a network of veins located in the broad ligament near the ovary and fallopian tube. These veins drain blood from the ovaries and uterine tubes and eventually merge into the ovarian vein.

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Ovarian Vein Drainage

The ovarian veins drain into the inferior vena cava on the right side and the left renal vein on the left. They travel with the ovarian artery within the suspensory ligament.

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Internal Pudendal Artery

The internal pudendal artery is a branch of the internal iliac artery that supplies blood to the external genitalia and the perianal region. It also contributes to the blood supply of the lower vagina.

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Vagina

The distensible fibromuscular tube that serves as the copulatory organ in women. It extends posterosuperiorly from the perineum through the pelvic floor to the pelvic cavity, where it surrounds the cervix.

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Uterus

A pear-shaped, muscular organ located in the pelvic cavity. It is responsible for housing and nourishing a developing fetus during pregnancy.

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Uterine Tubes

Two tubes that connect the ovaries to the uterus. They are responsible for transporting eggs to the uterus and facilitating fertilization.

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Ovaries

Paired almond-shaped organs located on either side of the uterus. They produce eggs and hormones like estrogen and progesterone.

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Ligaments of the Uterus

Fibrous bands that support and stabilize the uterus within the pelvic cavity. Examples include the broad ligament, round ligament, and uterosacral ligament.

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Uterovaginal venous plexus

A network of veins that drains blood from the vagina and uterus. It connects to the uterine venous plexus and ultimately drains into the internal iliac vein.

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Sympathetic innervation of the female reproductive organs

Nerves that originate from the thoracic spinal cord (T10-L2) and control vasoconstriction, contraction of smooth muscles in the internal urethral and anal sphincters, and contraction of smooth muscles in the reproductive tract and accessory glands.

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Parasympathetic innervation of the female reproductive organs

Nerves that originate from the sacral spinal cord (S2-S4) and cause vasodilation, stimulate bladder contraction, and facilitate erection of erectile tissues.

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Visceral afferent fibers of the female reproductive organs

Sensory fibers that travel along sympathetic and parasympathetic pathways, carrying pain information from the reproductive organs.

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Deep perineal nerve

A branch of the pudendal nerve that provides somatic innervation (touch, pain, temperature) to the inferior one-fifth of the vagina.

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Sympathetic innervation of the ovaries and uterine tubes

Nerves originating from the thoracic spinal cord (T10-L1 for ovaries, T11-L1 for tubes) control vasoconstriction and travel along ovarian vessels and lumbar splanchnic nerves.

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Visceral afferent pain of the ovaries and uterine tubes

Pain signals from these organs travel retrograde (upstream) with descending sympathetic fibers.

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Parasympathetic innervation of the ovaries and uterine tubes

Nerves that travel through the pelvic plexuses and pelvic splanchnic nerves, but their exact role in ovarian and tubal function is unclear.

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Lymphatic drainage of the uterus, uterine tubes, ovaries, and vagina

Lymph vessels collect fluid from these organs and drain into different lymph nodes based on location. The fundus of the uterus, tubes, and ovaries drain to lumbar nodes, the body of the uterus to external iliac nodes, the cervix and fornices to external and internal iliac nodes, the middle vagina to internal iliac nodes, the inferior vagina to common iliac and sacral nodes, and the vestibule to superficial inguinal nodes.

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Where do the lymph vessels from the vestibule of the vagina drain?

The lymph vessels from the vestibule of the vagina drain to the superficial inguinal nodes.

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Sex vs. Gender

Sex refers to biological differences, while gender encompasses social, cultural, and personal factors influencing identity. They are not always aligned and can vary independently.

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Intersex Variations

Individuals with sex characteristics that don't fit typical male or female categories; a spectrum of biological sex.

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Mons Pubis

The fatty, rounded area above the vulva, covered with pubic hair.

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Labia Majora

Two prominent, fleshy folds surrounding the vulva, extending from the mons pubis to the perineum.

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Labia Minora

Two smaller, thin folds inside the labia majora, surrounding the clitoris, vaginal opening, and urethral opening.

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Clitoris

A highly sensitive, erectile tissue at the top of the vulva, responsible for sexual pleasure and arousal.

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Vestibule

The area between the labia minora, containing the urethral opening and vaginal opening.

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Bulbs of the Vestibule

Two masses of erectile tissue located on either side of the vaginal opening, contributing to sexual arousal.

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Greater Vestibular Glands

Two small glands located on either side of the vaginal opening, producing lubrication for sexual activity.

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Nerve Supply of Vulva

The vulva receives sensory input from the pudendal nerve, along with branches from the ilioinguinal and genitofemoral nerves.

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Vestibule of Vagina

The space between the labia minora, containing the openings of the urethra and vagina.

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Hymen

A thin fold of mucous membrane that may cover the vaginal orifice, often ruptured during sexual intercourse.

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Frenulum of the Clitoris

The fold of skin where the labia minora unite anteriorly, covering the glans clitoris.

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Pudendal Cleft

The area between the labia majora, containing the labia minora and the vestibule.

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Posterior Commissure

The point where the labia majora join posteriorly, which may disappear after childbirth.

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Bulbs of Vestibule

Paired erectile tissues located on either side of the vaginal opening, homologous to the bulb of the penis in males. They are deep to the labia minora.

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Greater Vestibular Glands (Bartholin's Glands)

Paired glands located in the superficial perineal pouch, posterolateral to the vaginal opening. They secrete mucus into the vestibule during sexual arousal.

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What innervates the anterior aspect of the female external genitalia?

The anterior aspect, including the mons pubis and anterior labia majora, is primarily innervated by the anterior labial nerves from the ilioinguinal nerve and the genital branch of the genitofemoral nerve (both from the lumbar plexus).

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What innervates the posterior aspect of the female external genitalia?

The posterior aspect is innervated by: the perineal branch of the posterior cutaneous nerve of the thigh (sacral plexus) laterally, and the pudendal nerve centrally. The pudendal nerve supplies the labia, the vaginal opening, and the superficial perineal muscles.

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Pudendal Nerve: Function

The pudendal nerve is the main nerve supplying the perineal muscles. It innervates most of the perineal region, including muscles of the perineum, the vaginal opening, and the clitoris.

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Pudendal Canal: Location and content

The pudendal canal is a horizontal passageway within the obturator fascia that houses the pudendal nerve, artery, and vein, which provide the main blood supply and nerve supply to the external genitalia.

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Inferior Rectal Nerve: Function

A branch of the pudendal nerve that supplies the external anal sphincter and surrounding skin.

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Perineal Nerve: Branches and Function

The perineal nerve, another branch of the pudendal nerve, supplies sensation to the majority of the perineal region, including the vaginal opening. It branches into superficial and deep branches supplying different areas.

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Testicular Artery Origin

The testicular artery originates from the abdominal aorta, inferior to the renal arteries.

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Testicular Artery Course

The testicular artery travels retroperitoneally, crosses the ureters and external iliac arteries, enters the inguinal canal through the deep ring, exits through the superficial ring, joins the spermatic cord, and anastomoses with the artery of the ductus deferens.

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Pampiniform Plexus Function

The pampiniform plexus, a network of veins surrounding the testicular artery, helps regulate testicular temperature for optimal spermatogenesis.

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Testicular Vein Drainage

The right testicular vein drains into the inferior vena cava, while the left testicular vein drains into the left renal vein.

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Testis Nerve Supply

The testis receives autonomic innervation from the testicular plexus, containing sympathetic and visceral afferent fibers from T10-T11 and parasympathetic from the vagus nerve.

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Epididymis Function

The epididymis is a tightly packed, convoluted duct that receives sperm from the rete testis and transports it to the ductus deferens.

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Ductus Deferens Structure

The ductus deferens is a thick-walled muscular tube with a thin lumen, responsible for transporting sperm from the epididymis to the ejaculatory duct.

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Seminal Vesicle Location

The seminal vesicles are elongated structures located between the fundus of the bladder and the rectum.

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Ejaculatory Duct Formation

The ejaculatory duct is formed when the duct from the seminal vesicle joins the ductus deferens.

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Lymphatic Drainage of Testes

The lymphatic drainage of the testes is to the right and left lumbar (caval/aortic) and pre-aortic lymph nodes.

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Seminal Vesicle Function

Seminal vesicles produce an alkaline fluid that contributes to semen. This fluid contains fructose, which provides energy for sperm, and a coagulating substance.

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Scrotum Description

The scrotum is a cutaneous fibromuscular sac that encloses the testes and epididymi. It is divided into two compartments by a septum derived from the dartos fascia.

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Dartos Muscle Function

The dartos muscle, within the dartos fascia, contracts to wrinkle the skin of the scrotum. This helps in thermoregulation, keeping the testes at the optimal temperature for sperm production.

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Spermatic Cord Description

The spermatic cord is a structure that begins at the deep inguinal ring, passes through the inguinal canal, and ends in the scrotum at the posterior border of the testis.

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Spermatic Cord Contents

The spermatic cord contains structures running to or coming from the testes, including the ductus deferens, arteries, veins, nerves, lymphatic vessels, and the cremaster muscle.

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Scrotum Lymphatic Drainage

Lymphatic drainage from the scrotum goes to the superficial inguinal nodes.

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Layers of Spermatic Cord and Scrotum

The spermatic cord and scrotum have multiple layers. The internal spermatic fascia, cremasteric fascia, and external spermatic fascia surround the ductus deferens, vessels, and nerves. These structures are covered by the dartos fascia and the skin.

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Testis Structure

The testis is an oval-shaped organ within the scrotum, composed of seminiferous tubules where sperm is produced, and Leydig cells that secrete testosterone.

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Epididymis Location

The epididymis is a coiled tube attached to the posterior surface of the testis, where sperm matures and is stored.

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Testis Blood Supply

The testis receives blood from the testicular artery, a branch of the abdominal aorta.

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Vas Deferens Structure

The vas deferens is a muscular tube that carries mature sperm from the epididymis to the ejaculatory duct.

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Ejaculatory Ducts Location?

The ejaculatory ducts are short tubes that pass through the prostate gland, where they merge with the urethra.

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Scrotum: Macroscopic Structure

The scrotum is a sac of skin that encloses the testes, helping to regulate their temperature.

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Lymphatic Drainage: Testis vs. Scrotum

Lymphatic drainage from the testis is towards the lumbar lymph nodes, while the scrotum drains to superficial inguinal lymph nodes.

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Spermatic Cord Layers

The spermatic cord is covered by layers derived from the abdominal wall: internal spermatic fascia, cremasteric fascia, and external spermatic fascia.

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Bulbo-urethral Glands Position

The bulbo-urethral glands are located inferior to the prostate gland, near the bulb of the penis.

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Testes: Function

The testes are the male gonads, producing sperm for reproduction and testosterone, the primary male sex hormone.

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Seminiferous Tubules

Highly coiled tubes within the testes where sperm is produced through a complex process called spermatogenesis.

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Ductus Deferens

A muscular tube connecting the epididymis to the ejaculatory duct, transporting sperm during ejaculation.

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Prostate Gland: Function

A gland surrounding the urethra that produces a milky fluid that contributes to semen, aiding sperm motility and viability.

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Bulbourethral Glands: Function

Two small glands that produce a clear, viscous fluid that lubricates the urethra and neutralizes acidity, preparing for semen passage.

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Scrotum: Location & Function

A sac of skin located behind the penis, housing the testes and regulating their temperature for optimal sperm production.

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Penis: Function

The male external organ responsible for delivering sperm during sexual intercourse.

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Prostate Zones

The prostate gland is divided into three zones: peripheral, central, and transitional. The transitional zone is where benign prostatic hypertrophy (BPH) occurs, causing enlargement of the prostate.

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Prostatic Urethra Features

The prostatic urethra has features like prostatic sinuses, seminal colliculus, urethral crest, and prostatic utricle. These features prevent backward flow of semen and support the reproductive process.

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Prostatic Fluid Function

Prostatic fluid contributes 20% to the semen volume. It helps nourish sperm, provides protection, and facilitates sperm motility.

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Prostate Arterial Supply

The prostate receives blood from prostatic arteries, which are branches of the internal iliac artery. These branches include inferior vesical arteries, internal pudendal, and middle rectal arteries.

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Prostate Venous Drainage

Veins from the prostate form a plexus around the gland, called the prostatic venous plexus. This plexus connects with the vesical plexus and drains ultimately into the internal iliac veins.

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Prostate Innervation: Sympathetic

Sympathetic nerves (T12-L2) innervate the prostate, stimulating secretion during ejaculation. These nerves work through lumbar splanchnic nerves, hypogastric and pelvic plexuses.

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Prostate Innervation: Parasympathetic

Parasympathetic nerves (pelvic splanchnic) also innervate the prostate. They contribute to the prostatic plexus and ultimately the cavernous nerves, which help with penile erection.

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Prostate Lymphatic Drainage

Lymph from the prostate drains to the internal iliac nodes. These nodes are important for filtering and cleaning lymph fluid from the area.

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Penis Anatomy: Root, Body, Glans

The penis has three main parts: the root, body, and glans. Each part plays a role in its functionality.

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Penile Arterial Supply

The penis receives blood from branches of the external and internal pudendal arteries. The external pudendal supplies the skin, while the internal pudendal branches supply the erectile tissues and urethra.

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Deep Dorsal Artery

This artery runs along the dorsal groove of the penis, providing blood to the skin, fascia, and corpus spongiosum, which houses the urethra.

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Deep Artery of Penis

This artery pierces the crura (legs) of the penis and runs through the center of the corpora cavernosa, supplying blood for erections.

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Penile Venous Drainage

Blood is drained from the cavernous spaces via the deep dorsal vein, which connects to the prostatic venous plexus. The superficial dorsal vein collects blood from the skin.

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Penile Innervation

Nerves from the S2, S3, and S4 spinal nerves supply the penis. The dorsal nerve provides sensory and sympathetic innervation to the skin and glans, while parasympathetic nerves from pelvic splanchnic nerves control erections via cavernous nerves.

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Erection: What happens?

Parasympathetic stimulation relaxes smooth muscle in the cavernous arteries, increasing blood flow into the corpora cavernosa. Compression of veins prevents drainage, causing engorgement and rigidity.

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Penile Lymphatic Drainage

The skin drains into superficial inguinal nodes. The glans and distal urethra drain into deep inguinal nodes. The cavernous bodies and proximal urethra drain into internal iliac nodes.

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What is the role of cavernous nerves in erection?

Cavernous nerves, arising from the pelvic splanchnic nerves, carry parasympathetic signals that relax smooth muscle in the cavernous arteries, allowing increased blood flow and erection.

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Erection: Role of Compressing Veins

Muscles of the perineum, like the bulbospongiosus and ischiocavernosus, compress the veins draining the corpora cavernosa, preventing blood from exiting and maintaining the erection.

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What are the main nerve groups involved in penile function?

The main nerves are the dorsal nerve of the penis (sensory and sympathetic) and the cavernous nerves (parasympathetic) which play crucial roles in sensation and erection.

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Penis: What are the three cylindrical bodies?

The penis contains three cylindrical bodies of erectile tissue: two corpora cavernosa (dorsally) and one corpus spongiosum (ventrally).

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Tunica Albuginea

A fibrous covering that surrounds each erectile tissue in the penis, helping to maintain its structure and shape.

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Penis: Root

The fixed part of the penis, attached to the pelvic floor, containing the crura, bulb, and associated muscles.

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Crura

Paired, cylindrical structures of erectile tissue (corpora cavernosa) in the root of the penis that attach to the ischial rami.

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Bulb

The expanded, ventral part of the penis root, containing erectile tissue (corpus spongiosum) and the penile urethra.

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Penis: Body

The suspended, free part of the penis hanging from the pubic symphysis, containing the erectile tissues, urethra, and surrounding structures.

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Penis: Glans

The cone-shaped, distal expansion of the corpus spongiosum, forming the tip of the penis, containing the external urethral orifice.

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Corona

The rim-like projection of the glans penis, where it meets the corpora cavernosa.

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Prepuce

A double layer of skin and fascia that forms the foreskin, covering the glans penis.

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Suspensory Ligament

Strong ligament that attaches the penis to the public symphysis, anchoring the erectile tissues.

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Fundiform Ligament

A loose, superficial ligament running from the linea alba to the pubic symphysis, surrounding the penis and blending with the dartos fascia of the scrotum.

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Prostate Gland Location

The prostate gland sits beneath the bladder and in front of the rectum. It surrounds the prostatic urethra.

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Prostate Gland Structure

The prostate is made up of a fibrous capsule, containing prostatic venous and nerve plexuses. Its lobes are not clearly distinct, but include an isthmus, anterior to the urethra.

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Prostatic Urethra - Posterior Surfaces

The posterior surface of the prostatic urethra contains the seminal colliculus, with openings for the prostatic utricle and ejaculatory ducts.

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Prostate Gland - Blood Supply

The prostate is supplied by the inferior vesicle artery, internal pudendal artery, and middle rectal artery.

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Prostate Gland - Lymph Drainage

Lymphatics from the prostate drain into the internal iliac and sacral nodes.

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Penis - Blood Supply

Penile blood supply comes from the internal pudendal artery, branching into the dorsal artery, cavernous arteries, and bulbourethral arteries.

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Penis - Nerve Supply

The penis is innervated by the pudendal nerve (somatic) and the pelvic splanchnic nerves (parasympathetic).

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Penis - Erection Mechanism

Erection occurs when the cavernous arteries dilate, filling the corpora cavernosa with blood, compressing the veins and trapping the blood.

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Penis - Lymph Drainage

Lymph from the penis drains to the superficial inguinal nodes, and occasionally to the deep inguinal nodes.

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Pelvic Diaphragm

A muscular sheet that forms the floor of the pelvic cavity, supporting pelvic organs and regulating defecation. It consists of the levator ani and coccygeus muscles.

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Levator Ani

The main muscle of the pelvic diaphragm, divided into three parts: puborectalis, pubococcygeus, and iliococcygeus. It functions in supporting pelvic organs and controlling fecal continence.

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Perineum

The diamond-shaped area located between the thighs, inferior to the pelvic diaphragm. It comprises the urogenital triangle and the anal triangle.

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Urogenital Triangle

The anterior part of the perineum, containing the external genitalia and the urethra.

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Anal Triangle

The posterior part of the perineum, containing the anus.

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Perineal Body

A central point located at the junction of the urogenital and anal triangles. It serves as a point of attachment for various muscles in the perineum.

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Borders of the Perineum

The borders of the perineum are: Anteriorly - pubic symphysis, Posteriorly - coccyx, Laterally - ischial tuberosities.

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Superficial Muscles of the Perineum

These muscles are located in the subcutaneous tissue of the perineum, contributing to the control of the external urethral sphincter and helping support the pelvic organs.

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Deep Muscles of the Perineum

These muscles are located deeper within the perineum, contributing to support of pelvic organs and regulating defecation.

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Nerve Supply of the Perineum

The perineum is innervated by the pudendal nerve (S2-S4), which provides sensory and motor innervation to the external genitalia, anus, pelvic floor muscles, and surrounding skin.

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What is the pelvic cavity?

The pelvic cavity is a space enclosed by the pelvic girdle, situated between the trunk and lower limbs. It houses vital organs.

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What divides the pelvic cavity?

The pelvic brim, also known as the pelvic inlet, divides the pelvic cavity into the greater (false) pelvis and the lesser (true) pelvis. The lesser pelvis includes the pelvic cavity.

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What are the pelvic cavity walls?

The pelvic cavity has five walls: antero-inferior, posterior, and two lateral walls, along with a floor.

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What is the pelvic diaphragm?

The pelvic diaphragm is a muscular partition made up of the coccygeus and levator ani muscles. It separates the pelvic cavity from the perineum.

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What are the components of the levator ani muscle?

The levator ani muscle is made up of three parts: puborectalis, pubococcygeus, and iliococcygeus. These muscles contribute to pelvic floor support.

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What is the urogenital hiatus?

The urogenital hiatus is an anterior opening in the pelvic diaphragm, through which the urethra and vagina (in females) pass.

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What are the primary functions of the pelvic diaphragm?

The pelvic diaphragm is crucial for supporting pelvic viscera, maintaining closure of the rectum and vagina, and supporting the posterior pelvic floor.

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What is the puborectalis muscle's main function?

The puborectalis muscle forms a sling around the rectum, maintaining the perineal flexure, which keeps the rectum closed to ensure continence.

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How does the levator ani muscle contribute to continence?

The levator ani muscle plays a vital role in maintaining continence by supporting the pelvic viscera and facilitating closure of the rectum and vagina.

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Why is the pelvic diaphragm important?

The pelvic diaphragm is essential for proper function of the pelvic organs, providing support and regulation of continence. It forms a crucial barrier between the pelvic cavity and the perineum.

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Perineal Membrane

A thick fibrous sheet that partially covers the urogenital triangle, separating the superficial and deep perineal spaces.

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Urogenital Diaphragm

A muscular layer that forms the floor of the urogenital triangle, supporting muscles and the urethra.

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Urogenital Hiatus

A U-shaped opening in the levator ani muscles that is filled by the perineal membrane.

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Superficial Perineal Space

The space located below the perineal membrane, containing the external genitalia and associated muscles.

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Deep Perineal Space

The space located above the perineal membrane, containing muscles like the external urethral sphincter and neurovascular structures.

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Bulbospongiosus Muscle

A muscle in the superficial perineal space that helps with urination and ejaculation in males.

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Ischiocavernosus Muscle

A muscle in the superficial perineal space that contributes to erection of both penis and clitoris.

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Superficial Transverse Perineal Muscle

A muscle in the superficial perineal space that helps support the perineal body.

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Deep Transverse Perineal Muscle

A muscle in the deep perineal space that helps with urination and supports the perineal body.

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Study Notes

Urogenital Anatomy: Posterior Abdominal Wall

  • Lecture 1: Covers the posterior abdominal wall
  • Lecturer: Ms Kerri Keet, Senior Lecturer, Division of Clinical Anatomy, [email protected]
  • Location: Room 4021, Level 4, Tygerberg Campus
  • Outcomes: Students should be able to name and describe bony components, muscles, and structures of the posterior abdominal wall, including origin, insertion, action, innervation, and blood supply.

Bony Components of the Posterior Abdominal Wall

  • Contains five lumbar vertebrae and intervertebral discs
  • Structure provides stability and support
  • Important for spinal movement and weight distribution

Muscles of the Posterior Abdominal Wall

  • Psoas Major & Minor: Located anterior to vertebral bodies. Originates from lumbar vertebrae. Inserts into the lesser trochanter of the femur. Innervated by anterior rami of L1, L2, and L3. Function: Flexes thigh at hip in conjunction with iliacus.
  • Iliacus: Originates laterally on iliac fossa. Inserts into lesser trochanter of femur, and is innervated by femoral nerve. Function: Flexes the thigh at the hip joint
  • Quadratus Lumborum: Originates from the iliolumbar ligament and iliac crest. Inserts into the transverse processes of L1 through L4 vertebrae inferior aspect of rib 12. Innervated by anterior rami of T12, L1,2,3, and L4. Function: Depresses ribs, stabilizes rib 12 and assists in lateral flexion of the trunk

Structures of the Posterior Abdominal Wall

  • Nerves (Lumbar Plexus, Sympathetic nerves): Provides motor and sensory function in the area
  • Arteries (abdominal aorta and branches): Deliver oxygenated blood to the region
  • Veins (inferior vena cava and tributaries): Drain deoxygenated blood from the area
  • Lymphatic vessels and lymph nodes: Drains lymph from the region
  • Fascia: Layers of connective tissue supporting the abdominal wall

Diaphragm

  • Structure & attachments: The diaphragm is a dome-shaped muscle separating the thoracic and abdominal cavities. It is composed of a central tendon and surrounding muscular sections (sternal, costal, and lumbar).
  • Position: Position varies based on breathing, posture, and abdominal viscera position
  • Blood supply: Inferior phrenic arteries and veins supply blood to the diaphragm
  • Nerve: Phrenic nerves (C3, C4, C5) innervate the diaphragm
  • Openings and vertebral levels:
    • Caval opening: Inferior Vena Cava: T8
    • Esophageal hiatus: T10
    • Aortic hiatus: T12

Retroperitoneal Space and Fascia

  • Structures: The space behind the peritoneum lining the posterior abdominal wall includes structures like kidneys, ureters, and abdominal blood vessels.
  • Retroperitoneal structures lie behind the peritoneum and supported by connective tissue layers, called fasciae (connective tissues).
  • Fasciae named based on the structures (psoas, renal, thoracolumbar)
  • Retroperitoneal spaces and membranes surround structures that are located behind the peritoneum

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