Pelvic Floor And Wall Muscles

Question 1

Levator ani muscles innervation

Answer 1

Direct branches of sacral plexus (S4). Inferior anal nerve

Question 2

Levator ani muscle action

Answer 2

Pelvic diaphragm: support pelvic viscera

Question 3

Piriformis origin

Answer 3

Sacrum (pelvic surface)

Question 4

Piriformis insertion

Answer 4

Femur (apex of greater trochanter)

Question 5

Piriformis innervation

Answer 5

Direct branches from sacral plexus S1-S2

Question 6

Piriformis action

Answer 6

Hip joint: ext rotation, stabilization , and abduction of the flexed hip

Question 7

Coccygeus origin

Answer 7

Sacrum (inferior end)

Question 8

Coccygeus insertion

Answer 8

Ischial spine

Question 9

Coccygeus innervation

Answer 9

Direct branches from sacral plexus S4-S5

Question 10

Coccygeus action

Answer 10

Supports pelvic viscera , flexes coccyx

Question 11

Obturator internus origin

Answer 11

Obdurator membrane and bony boundaries (inner surface)

Question 12

Obturator internus insertion

Answer 12

Femur (medial surface of greater trochanter)

Question 13

Obturator internus innervation

Answer 13

Direct branches from sacral plexus L5-S1

Question 14

Obturator internus action

Answer 14

Hip joint: ext rotation and abduction of flexed hip

Question 15

Levator ani common origin

Answer 15

Tendonius arch

Question 16

Levator ani common insertion

Answer 16

Anococcygeal lig