L4 (T2): Anatomy of the pelvic region

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Questions and Answers

What are the primary joints of the pelvis?

Sacro-iliac joints and pubic symphysis (correct)

Sacro-iliac joints and sacrum

Sacro-iliac joints and ischial tuberosities

Pubic symphysis and ischial tuberosities

Which bones compose the pelvis?

Ilium, ischium, pubis, sacrum, coccyx (correct)

Ilium, ischium, sacrum, coccyx, pubic symphysis

Ilium, ischium, pubis, femur, sacrum

Ilium, sacrum, coccyx, femur, pubic symphysis

What forms the sacrum?

Fusion of the coccygeal vertebrae

Fusion of the 5 sacral vertebrae (correct)

Fusion of the lumbar vertebrae

Fusion of the thoracic vertebrae

What forms the coccyx?

Fusion of the 4 coccygeal vertebrae Signup and view all the answers

How many hip bones make up the pelvis?

Two innominate (hip) bone that form from 3 bones: ilium, ischium and pubis Signup and view all the answers

What is the function of the pubic symphysis?

It transfers weight from the axial skeleton to the ilia via ligaments to the femurs during standing Signup and view all the answers

What is the composition of the ischial tuberosities?

They are weight-bearing structures during sitting Signup and view all the answers

Which structures define the lesser and greater pelvis spaces?

Structures/landmarks Signup and view all the answers

What are the boundaries of the lesser and greater pelvis?

Structures/landmarks Signup and view all the answers

Which structures compose the pelvic wall and floor?

Muscles Signup and view all the answers

What are the main vessels plus nerves intrinsic to the pelvis?

Innervation (somatic and autonomic) Signup and view all the answers

How is weight transferred during sitting in the pelvis?

To the ischial tuberosities Signup and view all the answers

What forms the bony edge defining the pelvic inlet?

Promontory and ala of sacrum Signup and view all the answers

Which muscle rotates the thigh laterally and abducts the thigh?

Piriformis Signup and view all the answers

What is the function of the pelvic diaphragm?

To support the pelvic viscera Signup and view all the answers

What defines the perineal body?

The convergence of several sphincter and perineal pouch muscles Signup and view all the answers

What artery is the main artery in the pelvis?

Internal iliac artery Signup and view all the answers

What ligament is posterior to the sacrospinous ligament?

Sacrotuberous ligament Signup and view all the answers

What defines the pelvic outlet?

Pubic arch anteriorly, ischial tuberosities laterally, coccyx posteriorly Signup and view all the answers

What is the space bounded by the bony, ligamentous, and muscular pelvic walls and floor?

Pelvic cavity Signup and view all the answers

What muscle forms the lateral pelvic walls?

Right and left hip bones Signup and view all the answers

What forms the bony edge defining the pelvic outlet?

Pubic arch, ischial tuberosities, coccyx Signup and view all the answers

What is the function of the obturator internus muscle?

Rotates the thigh laterally Signup and view all the answers

What is the shape of the pelvic inlet?

Heart-shaped Signup and view all the answers

What structures form part of the pelvic inlet?

Sacral promontory, margin of the sacrum Signup and view all the answers

What is the impact of uneven weight distribution on the pelvis?

Blowout fracture Signup and view all the answers

Which articulation is involved in weight transfer through the pelvis?

Sacroiliac joint Signup and view all the answers

What defines the pelvic inlet/pelvic brim?

Start of the true pelvis Signup and view all the answers

Where is the obturator foramen located?

Between ilium, ECM, and pubis Signup and view all the answers

What is the function of the pelvic articulation for weight transfer?

Facilitates weight transfer Signup and view all the answers

Which structure is formed by the fusion of the ilium, ischium, and pubis, and attaches to the femur?

Acetabulum Signup and view all the answers

At what age is the fusion of bones in the pelvis generally completed?

30 Signup and view all the answers

Which structure bears most of the body weight when sitting down?

Ischial tuberosity Signup and view all the answers

Which structure is important for administering an epidural block during childbirth?

Ischial spine Signup and view all the answers

What is the main function of the ischial spine?

Attachment site for muscles and ligaments Signup and view all the answers

Which structure is formed by the fusion of the ilium, ischium, pubis, sacrum, and coccyx?

Hip bone Signup and view all the answers

Which structures form the greater and lesser sciatic foramen?

Sacrotuberous and sacrospinous ligaments Signup and view all the answers

What is the main distinction between the true and false pelvis?

Presence of urogenital and reproductive structures Signup and view all the answers

What influences the geometry of the pelvis, especially before puberty?

Hormone therapy Signup and view all the answers

What is the significance of the greater and lesser sciatic foramen in the pelvis?

Important structures often covered by the obturator membrane Signup and view all the answers

Which structures form the pelvic inlet?

Sacral promontory, wing of the sacrum, accurate line of the ilium, back to it line of the pubic bone, pubic crest, and symphysis Signup and view all the answers

Which ligament stabilizes the joint between the sacrum and ilium?

Sacroiliac ligament Signup and view all the answers

What forms the pelvic outlet?

Coccyx, sacral tuberous ligament, pubic arch, and part of the pubic symphysis Signup and view all the answers

Which ligament stabilizes the joint between the sacrum and ischial spine?

Sacrospinous ligament Signup and view all the answers

What is the function of the pelvic girdle's articulation?

Crucial for weight transfer and energy resistance Signup and view all the answers

What divides the space into two foramina, through which structures can pass?

Sacrospinous and sacrotuberous ligaments Signup and view all the answers

Study Notes

Anatomy of Pelvic Inlet and Outlet

The red line is the accurate line, the bony boundary of the ilium.
The blue line is the back to it line, associated with the superior ramus of the pubic bone.
The pelvic inlet is formed by the sacral promontory, wing of the sacrum, accurate line of the ilium, back to it line of the pubic bone, and the pubic crest and symphysis.
The pelvic outlet is formed by the coccyx, sacral tuberous ligament, pubic arch, and part of the pubic symphysis.
The pelvic girdle's articulation is crucial for weight transfer and energy resistance.
Three important ligaments are sacroiliac, sacrospinous, and sacrotuberous, stabilizing the pelvic girdle.
The sacroiliac ligament stabilizes the joint between the sacrum and ilium.
The sacrospinous ligament stabilizes the joint between the sacrum and ischial spine.
The sacrotuberous ligament stabilizes the joint between the sacrum and ischial tuberosity.
The sacroiliac, sacrospinous, and sacrotuberous ligaments ensure pelvic girdle stability.
The sacrospinous and sacrotuberous ligaments divide the space into two foramina, through which structures can pass.
The foramina are openings through which different structures can pass.

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Description

Test your knowledge of the anatomy of the pelvic region with this quiz. Explore the structures, bones, muscles, and landmarks that define the pelvis and its spaces. Assess your understanding of the pelvic floor and key vesicles.