Podcast
Questions and Answers
What forms the anterior pelvic wall?
What forms the anterior pelvic wall?
- Bodies of the pubic bones and the symphysis pubis (correct)
- Iliac bones and sacroiliac joints
- Sacrum and coccyx
- Piriformis muscles and their covering of fascia
What is the function of the pelvic cavity's inferior wall?
What is the function of the pelvic cavity's inferior wall?
- Provide a depth for the pelvic inlet
- Support the abdominal organs
- Act as a barrier for pelvic contents (correct)
- House muscular structures only
Which of the following best describes the posterior pelvic wall?
Which of the following best describes the posterior pelvic wall?
- Extensive and formed by the sacrum and coccyx (correct)
- Lined with abdominal muscles and parietal peritoneum
- Deep and consists entirely of connective tissue
- Shallow and primarily formed by the iliac bones
What bone structure articulates with the fifth lumbar vertebra?
What bone structure articulates with the fifth lumbar vertebra?
Which component primarily makes up the lateral walls of the pelvis?
Which component primarily makes up the lateral walls of the pelvis?
The pelvic outlet is best described as?
The pelvic outlet is best described as?
What primarily forms the walls of the pelvis?
What primarily forms the walls of the pelvis?
Which structures contribute to the formation of the sacroiliac joints?
Which structures contribute to the formation of the sacroiliac joints?
Which muscle is part of the lateral pelvic wall?
Which muscle is part of the lateral pelvic wall?
What connects the three separate bones at the acetabulum in children?
What connects the three separate bones at the acetabulum in children?
What was the cause of the blood-stained fluid expressed from the external orifice of the penis in the case of the 51-year-old man?
What was the cause of the blood-stained fluid expressed from the external orifice of the penis in the case of the 51-year-old man?
Where is the acetabulum located on the hip bone?
Where is the acetabulum located on the hip bone?
Which of the following best describes the patient's condition upon admission?
Which of the following best describes the patient's condition upon admission?
Which ligaments contribute to the lateral pelvic wall?
Which ligaments contribute to the lateral pelvic wall?
What type of fracture was identified in the patient during radiographic examination?
What type of fracture was identified in the patient during radiographic examination?
Which bones fuse together to form the hip bone at puberty?
Which bones fuse together to form the hip bone at puberty?
What primary anatomical feature was affected by the forces during the plane accident?
What primary anatomical feature was affected by the forces during the plane accident?
During examination, what was the condition of the patient's external hemorrhage?
During examination, what was the condition of the patient's external hemorrhage?
What anatomical knowledge is emphasized as necessary for physicians in trauma cases like this?
What anatomical knowledge is emphasized as necessary for physicians in trauma cases like this?
What does the hip bones articulate with anteriorly?
What does the hip bones articulate with anteriorly?
What is formed by the part of the hip bone below the pelvic inlet?
What is formed by the part of the hip bone below the pelvic inlet?
Where do the median sacral veins typically end?
Where do the median sacral veins typically end?
What separates the greater sciatic notch from the lesser sciatic notch?
What separates the greater sciatic notch from the lesser sciatic notch?
Which factor contributed most significantly to the patient's state of hypovolemic shock?
Which factor contributed most significantly to the patient's state of hypovolemic shock?
The anterior superior iliac spine is located at the anterior end of which structure?
The anterior superior iliac spine is located at the anterior end of which structure?
Where can the pubic tubercle be palpated?
Where can the pubic tubercle be palpated?
What causes pain in the lumbosacral region during movements of the vertebral column?
What causes pain in the lumbosacral region during movements of the vertebral column?
What structure forms by the joining of the internal iliac vein and external iliac vein?
What structure forms by the joining of the internal iliac vein and external iliac vein?
How is the pelvic inlet shaped differently in males and females?
How is the pelvic inlet shaped differently in males and females?
What was the result of the tearing of the pelvic veins in this case?
What was the result of the tearing of the pelvic veins in this case?
Which lymph nodes are associated with the internal iliac artery?
Which lymph nodes are associated with the internal iliac artery?
In sacroiliac disease, what movement is particularly painful?
In sacroiliac disease, what movement is particularly painful?
What effect does relaxin have on the pelvic ligaments?
What effect does relaxin have on the pelvic ligaments?
What anatomical feature distinguishes the male pelvis from the female pelvis?
What anatomical feature distinguishes the male pelvis from the female pelvis?
Which bony feature serves as a notable surface landmark along the pelvic wall?
Which bony feature serves as a notable surface landmark along the pelvic wall?
Which statement about the pelvic outlet is true in the context of male and female anatomy?
Which statement about the pelvic outlet is true in the context of male and female anatomy?
What is the main reason the sacroiliac joint becomes inaccessible to clinical examination?
What is the main reason the sacroiliac joint becomes inaccessible to clinical examination?
Which nerve influences pain referred from the sacroiliac joint?
Which nerve influences pain referred from the sacroiliac joint?
What anatomical relationship does the posterior superior iliac spine have?
What anatomical relationship does the posterior superior iliac spine have?
Which muscle is primarily associated with the examination of the iliac crest?
Which muscle is primarily associated with the examination of the iliac crest?
Study Notes
Pelvic Walls
- The pelvic walls are formed by bones, ligaments, muscles, fascia, and parietal peritoneum
- The pelvis is divided into anterior, posterior, lateral, and inferior walls.
Anterior Pelvic Wall
- Formed by the pubic bones, pubic rami, and symphysis pubis.
- Shallowest wall
Posterior Pelvic Wall
- Formed by the sacrum, coccyx, piriformis muscles, and parietal pelvic fascia.
- Most extensive wall.
Sacrum
- Composed of five fused vertebrae.
- Wedge-shaped with an anterior concavity.
- Superior border articulates with the fifth lumbar vertebra.
- Inferior border articulates with the coccyx.
- Lateral sides articulate with the iliac bones to form the sacroiliac joints.
Lateral Pelvic Wall
- Forme by the hip bone, obturator membrane, sacrotuberous, and sacrospinous ligaments.
- The obturator internus muscle and its covering fascia are also part of the wall.
Hip Bone
- In children, the hip bone is composed of three separate bones: the ilium, ischium, and pubis.
- At puberty, the three bones fuse together to form a single large bone.
- The hip bone articulates with the sacrum at the sacroiliac joint.
- They also articulate with each other at the symphysis pubis.
Joint Changes with Age
- The cavity in the sacroiliac joint obliterates after middle age.
Sacroiliac Joint Disease
- Sacroiliac joints are innervated by the lower lumbar and sacral nerves.
- Disease in the joint can cause both low back pain and pain referred along the sciatic nerve (sciatica).
- It is difficult to examine the sacroiliac joint during physical examination.
Biologic Sex Differences
- The female pelvis is wider and shallower than the male pelvis, adapting for childbirth.
- The pelvic inlet is transversely oval in females and heart-shaped in males.
- The pelvic capacity is larger in females, and the distance between the pelvic inlet and outlet is shorter.
Pelvic Veins
- The internal iliac vein originates from tributaries corresponding to the branches of the internal iliac artery.
- It ascends in front of the sacroiliac joint and joins the external iliac vein to form the common iliac vein.
Pelvic Lymphatics
- Lymph nodes and vessels run along the main blood vessels in a chain.
- Nodes are named after the blood vessels they are associated with.
Surface Anatomy
- Several bony features of the pelvic walls can be palpated in an adult.
- Significant portions of the underlying urogenital tracts are also palpable.
Iliac Crest
- Can be felt through the skin along its entire length.
Anterior Superior Iliac Spine
- Located at the anterior end of the iliac crest.
- Lies at the upper lateral end of the fold of the groin.
Posterior Superior Iliac Spine
- Located at the posterior end of the iliac crest.
- Lies at the bottom of a small skin dimple.
Pubic Tubercle and Crest
- Pubic tubercle can be felt on the upper border of the pubis.
- The medial end of the inguinal ligament is attached to it.
- The tubercle can be palpated easily in males by invaginating the scrotum from below with the examining finger.
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Description
Explore the intricate structure of the pelvic walls, including the anterior, posterior, and lateral sections. This quiz covers important aspects such as the formation, components, and functions of the pelvis. It is essential for students studying human anatomy and physiology.
