Muscles of the Pelvic Wall

Question 1

Origin of Piriformis

Answer 1

Sacrum

Question 2

Insertion of Piriformis

Answer 2

Femur (apex of greater trochanter)

Question 3

Innervation of Piriformis

Answer 3

Direct branches from sacral plexus (S1-S2)

Question 4

Action of Piriformis

Answer 4

Hip Joint: External rotation, stabilization, and abduction of flexed hip

Question 5

Origin of Obturator internus

Answer 5

Obturator membrane and bony boundaries (inner surface)

Question 6

Insertion of Obturator internus

Answer 6

Femur (greater trochanter, medial surface)

Question 7

Innervation of Obturator internus

Answer 7

Direct branches from sacral plexus (L5-S1)

Question 8

Action of Obturator internus

Answer 8

Hip Joint: External rotation and abduction of flexed hip

Question 9

What are the muscles of the pelvic wall?

Answer 9

Piriformis and Obturator internus