Deep Muscles of Hip

Question 1

Obturator internus

Answer 1

origin from portions of ilium and ischium

insert on medial aspect of trochanter

action: lateral rotation and hip stabilization

Question 2

Obturator externus

Answer 2

origin from the external surface of the obturator membrane and passes posterior to the femoral neck

inserts onto the medial surface of the greater trochanter

action: lateral rotation

Question 3

Gemellus superior

Answer 3

small muscle located above and below the distal borders of the obturator internus

action: lateral rotation and hip stabilization

Question 4

Gemellus inferior

Answer 4

small muscle located above and below the distal borders of the obturator internus

action: lateral rotation and hip stabilization

Question 5

Quadratus femoris

Answer 5

origin from the lateral ischium and attaches to the posterior aspect of the greater trochanter

action: lateral rotation and hip stabilization

Question 6

Piriformis

Answer 6

origin on the anterior sacrum (2-4)

insert on top of greater trohanter

action: laterally rotates thigh abduction of thigh