Pelvic Diaphragm and Pelvic Walls

Question 1

What are the muscles of the pelvic diaphragm?

Answer 1

Levator ani
Coccygeus
Obturator internus

Question 2

What muscles make up levator ani?

Answer 2

Iliococcygeus
Pubococcygeus
Puborectalis

Question 3

What is the origin and insertion of levator ani?

Answer 3

O - pubis and ischial spine

I - perineal body and coccyx

Question 4

What is the action and innervation of levator ani?

Answer 4

A - supports pelvic viscera and reinforces sphincter of rectum
I - pudendal nerve

Question 5

What is the origin and insertion of coccygeus?

Answer 5

O - ischial spine and sacrospinous ligament

I - coccyx and sacrum

Question 6

What is the action and innervation of coccygeus?

Answer 6

A - supports pelvic viscera and pulls coccyx forward after defecation
I - spinal nerve

Question 7

What is the origin and insertion of obturator internus?

Answer 7

O - anterolateral wall

I - femur

Question 8

What is the action and innervation of obturator internus?

Answer 8

A - laterally rotates hip

I - obturator nerve