Podcast
Questions and Answers
What is the length of the male prostatic urethra?
What is the length of the male prostatic urethra?
Where does the female urethra extend to externally?
Where does the female urethra extend to externally?
Which part of the male urethra is the narrowest?
Which part of the male urethra is the narrowest?
Which structure surrounds the male membranous urethra?
Which structure surrounds the male membranous urethra?
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Where does the venous drainage of the male anterior urethra lead to?
Where does the venous drainage of the male anterior urethra lead to?
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In males, where does the posterior urethra drain lymphatic fluid to?
In males, where does the posterior urethra drain lymphatic fluid to?
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Where is the urinary bladder located in adults when empty?
Where is the urinary bladder located in adults when empty?
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What structure connects the apex of the bladder to the umbilicus?
What structure connects the apex of the bladder to the umbilicus?
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Which part of the bladder is related to the vas deferentia and seminal vesicles in males?
Which part of the bladder is related to the vas deferentia and seminal vesicles in males?
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In females, what structure is reflected near the post border of the superior surface of the bladder?
In females, what structure is reflected near the post border of the superior surface of the bladder?
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What lies above the infrolateral surfaces of the male bladder?
What lies above the infrolateral surfaces of the male bladder?
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What structure accommodates the distention of the bladder and is continuous with fat in the anterior abdominal wall?
What structure accommodates the distention of the bladder and is continuous with fat in the anterior abdominal wall?
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Which structure forms the floor of the retropubic space in both males and females?
Which structure forms the floor of the retropubic space in both males and females?
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Which part of the bladder is related to the pelvic fascia in females?
Which part of the bladder is related to the pelvic fascia in females?
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What is the role of the median umbilical ligament in bladder anatomy?
What is the role of the median umbilical ligament in bladder anatomy?
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Which area of the bladder is located between the two ureter openings and the urethra?
Which area of the bladder is located between the two ureter openings and the urethra?
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What is the primary arterial supply to the bladder?
What is the primary arterial supply to the bladder?
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Which nerve fibers transmit pain sensation resulting from overdistention of the bladder?
Which nerve fibers transmit pain sensation resulting from overdistention of the bladder?
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Study Notes
Urethra Length and Structure
- Male prostatic urethra measures approximately 3 cm in length.
- Female urethra extends externally to the vaginal opening.
Urethra Features
- The narrowest part of the male urethra is the membranous urethra.
- The membranous urethra is surrounded by the external urethral sphincter.
Venous and Lymphatic Drainage
- Venous drainage of the male anterior urethra is directed to the internal pudendal vein.
- Posterior urethra in males drains lymphatic fluid to the internal iliac lymph nodes.
Urinary Bladder Anatomy
- When empty, the urinary bladder is located in the lesser pelvis, posterior to the pubic symphysis in adults.
- The median umbilical ligament connects the apex of the bladder to the umbilicus.
Bladder Relationships
- The posterior surface of the bladder in males is related to the vas deferentia and seminal vesicles.
- In females, the peritoneum is reflected near the posterior border of the superior surface of the bladder.
Adjacent Structures
- The inferolateral surfaces of the male bladder are situated above the prostate gland.
- A layer of fascia accommodates bladder distention and is continuous with the subcutaneous fat in the anterior abdominal wall.
Pelvic Spaces
- The floor of the retropubic space is formed by the pubic symphysis anteriorly and the bladder posteriorly in both sexes.
- The pelvic fascia in females is related to the superior surface of the bladder.
Ligament Functions and Bladder Areas
- The median umbilical ligament serves the role of supporting the bladder and maintaining its position.
- The trigone area is located between the two ureter openings and the urethra, representing a smooth triangular region.
Blood Supply and Sensation
- The primary arterial supply to the bladder comes from the superior and inferior vesical arteries.
- Pain sensation from bladder overdistention is transmitted by visceral nerve fibers.
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Description
Learn about the anatomy of the urinary bladder and urethra, their location, shape, and relations, which vary with the amount of urine. Understand how an empty bladder changes from being a pelvic to an abdominal organ as it fills up.