bony pelvis and pelvic viscera

Question 1

pubococcygeus

Answer 1

O: pubis (lateral to origin of puborectalis)
I: anococcygeal ligament
coccyx
N: direct branches of sacral plexus (S4);
inferior anal nerve
A: Pelvic diaphragm-supports pelvic viscera

Question 2

iliococcygeus

Answer 2

O: internal obturator fascia of levator ani (tendinous arch)
I: anococcygeal ligament;
coccyx
N: direct branches of sacral plexus (S4);
inferior anal nerve
A: Pelvic diaphragm-supports pelvic viscera

Question 3

coccygeus

Answer 3

O: sacrum (inferior end)
I: ischial spine
N: direct branches from sacral plexus (S4-S5)
A: supports pelvic viscera;
flexes coccyx

Question 4

piriformis

Answer 4

O: sacrum (pelvic surface)
I: femur (apex of greater trochanter) 
N: direct branches from sacral plexus (S1-S2)
A: Hip joint- external rotation
stabilization
abduction of flexed hip

Question 5

obturator internus

Answer 5

O: obturator membrane and bony boundaries (inner surface)
I: femur (greater trochanter; medial surface)
N: direct branches from sacral plexus (L5-S1)
A: hip joint- external rotation;
abduction of flexed hip

Question 6

pelvic diaphragm- puborectalis

Answer 6

O: superior pubic ramus (both sides of pubic symphysis)
I: Anococcygeal ligament
N: direct branches of sacral plexus (S4);
inferior anal nerve
A: Pelvic diaphragm-supports pelvic viscera