Deep Gluteal Muscles

Question 1

Main function

Answer 1

lat rotators of hip @ post.aspect of vertical axis

Question 2

Piriformis: Origin, insertion, innervation, and function

Answer 2

Origin: ant. surface sacrum
Insertion: apex @ greater trochanter
Innervation: S1 + S2 branches
Function: lat rotate extended femur + abduct flexed femur

Question 3

Superior gemellus: Origin, insertion, innervation, and function

Answer 3

Origin: ischial spine
Insertion: med. greater trochanter via obturator tendon
Innervation: n. to obturator internus L5, S1
Function: lat rotate extended femur + abduct flexed femur

Question 4

Obturator internus: Origin, insertion, innervation, and function

Answer 4

Origin: ischiopubic ramus + post obturator membrane
Insertion: med. greater trochanter
Innervation: n. to obturator internus L5, S1
Function: lat rotate extended femur + abduct flexed femur

Question 5

Inferior Gemellus: Origin, insertion, innervation, and function

Answer 5

Origin: ischial tuberosity
Insertion: med. greater trochanter via obturator tendon
Innervation: n. to quadratus femoris L5, S1
Function: lat rotate extended femur + abduct flexed femur

Question 6

Quadratus Fem: Origin, insertion, innervation, and function

Answer 6

Origin: lat. aspect ischial tuberosity
Insertion: quadrate tubercle
Innervation: n. to quadratus femoris L5, S1
Function: lat. rotate femur

Question 7

Obturartor externus: Origin, insertion, innervation, and function

Answer 7

Origin: ant. obturator membrane + bone of obturator foramen
Insertion: trochanteric fossa
Innervation: obturator n. L2, L3, L4
Function: stabilize head of femur in acetabulum + lat. rotate femur