Lateral Rotators of the Hip

Question 1

Piriformis
Origin & Insertion

Answer 1

Origin: anterior surface lateral edge of sacrum

Insertion: superior border of greater trochanter

Question 2

Piriformis
Action & Innervation

Answer 2

Action:

• lateral/external rotatation of hip
• abduct & extensions
• stabilization of hip

Nerve: Sacral plexus (S1, 2)

Question 3

Gemellus superior
Action & Innervation

Answer 3

• laterally rotate the hip

Nerve: Sacral plexus

Question 4

Gemellus superior
Origin & Insertion

Answer 4

Origin: ischial spine

Insertion: medial surface of the greater trochanter

Question 5

Gemellus inferior
Origin & Insertion

Answer 5

Origin: ischial tuberosity

Insertion: medial surface of greater trochanter

Question 6

Gemellus inferior
Action & Innervation

Answer 6

• laterally rotate the hip
• sacral plexus

Question 7

Obturator internus
Origin & Insertion

Answer 7

Origin: obturator membrane & interior surface of the obturator foramen

Insertion: medial surface of the greater trochanter

Question 8

Obturator internus
Action & Innervation

Answer 8

• laterally rotate the hip
• sacral plexus

Question 9

Obturator externus
Origin & Insertion

Answer 9

Origin: rami of pubis & ischium, obturator membrane

Insertion: trochanteric fossa of femur

Question 10

Obturator externus
Action & Innervation

Answer 10

• laterally rotate the hip

-OBTURATOR NERVE

Question 11

Quadratus femoris
Origin & Insertion

Answer 11

Origin: lateral border of ischial tuberosity

Insertion: intertrochanteric crest, between greater & lesser trochanters

Question 12

Quadratus femoris
Action & Innervation

Answer 12

• laterally rotate the hip
• sacral plexus