Pelvic Wall and Floors Muscles

Question 1

piriformis (origin)

Answer 1

front of lateral mass of sacrum

Question 2

piriformis (insertion)

Answer 2

greater trochanter of femur

Question 3

piriformis (nerve)

Answer 3

sacral plexus

Question 4

piriformis (action)

Answer 4

lateral rotator of femur at hip joint

Question 5

obturator internus (origin)

Answer 5

obturator membrane and adjoining part of hip bone

Question 6

obturator internus (insertion)

Answer 6

greater trochanter of femur

Question 7

obturator internus (nerve)

Answer 7

nerve to obturator internus from sacral plexus

Question 8

obturator internus (action)

Answer 8

lateral rotator of femur at hip joint

Question 9

levator ani (origin)

Answer 9

body of pubis, fascia of obturator internus, and ischial spine

Question 10

levator ani (insertion)

Answer 10

perineal body, anococcygeal body, and walls of prostate, vagina, and anal canal

Question 11

levator ani (nerve)

Answer 11

fourth sacral nerve, pudendal nerve

Question 12

levator ani (action)

Answer 12

supports pelvic viscera; sphinter to anorectal junction and vagina

Question 13

coccygeus (origin)

Answer 13

ischial spine

Question 14

coccygeus (insertion)

Answer 14

lower part of sacrum; coccyx

Question 15

coccygeus (nerve)

Answer 15

fourth and fifth sacral nerves

Question 16

coccygeus (action)

Answer 16

assists levator ani in supporting pelvic viscera; flexes coccyx