Deep Gluteal Muscles

Question 1

Piriformis origin

Answer 1

Anterior surface of sacrum between anterior sacral foramina

Question 2

Piriformis insertion

Answer 2

Greater trochanter of femur

Question 3

Piriformis innervation

Answer 3

Branches from L5, S1, S2

Question 4

Piriformis function

Answer 4

Laterally rotates extended femur at hip joint, abducts flexed femur at hip joint

Question 5

Obturator internus origin

Answer 5

Anterolateral wall of true pelvis, deep surface of obturator membrane and surrounding bone

Question 6

Obturator internus insertion

Answer 6

Greater trochanter of femur

Question 7

Obturator internus innervation

Answer 7

Nerve to obturator internus (L5, S1)

Question 8

Obturator internus function

Answer 8

Laterally rotates extended femur at hip joint, abducts flexed femur at hip joint

Question 9

Gemellus superior origin

Answer 9

Ischial spine

Question 10

Gemellus superior insertion

Answer 10

Greater trochanter with obturator internus tendon

Question 11

Gemellus superior innervation

Answer 11

Nerve to obturator internus (L5, S1)

Question 12

Gemellus superior function

Answer 12

Laterally rotates extended femur at hip joint, abducts flexed femur at hip joint

Question 13

Gemellus inferior origin

Answer 13

Ischial spine

Question 14

Gemellus inferior insertion

Answer 14

Greater trochanter with obturator internus tendon

Question 15

Gemellus inferior innervation

Answer 15

Nerve to quadratus femoris (L5, S1)

Question 16

Gemellus inferior function

Answer 16

Laterally rotates extended femur at hip joint, abducts flexed femur at hip joint

Question 17

Quadratus femoris origin

Answer 17

Lateral aspect of ischium

Question 18

Quadratus femoris insertion

Answer 18

Quadrate tubercle on intertrochanteric crest of femur

Question 19

Quadratus femoris innervation

Answer 19

Nerve to quadratus femoris (L5, S1)

Question 20

Quadratus femoris function

Answer 20

Laterally rotates femur at hip joint