The gemelli, obturator internus, and quadratus femoris (dave's notes)

Question 1

What is the origin and insertion of gemellus superior?

Answer 1

Origin: Spine of ischium
Insertion: Middle part of the medial aspect of greater trochanter of femur

Question 2

What is the origin and insertion of obturator internus?

Answer 2

Origin: Inner surface of obturator membrane and rim of the pubis and ischium bordering membrane
Insertion: Middle part of the medial aspect of greater trochanter of femur

Question 3

What is the origin and insertion of gemellus inferior?

Answer 3

Origin: Upper border of ischial tuberosity
Insertion: Middle part of the medial aspect of greater trochanter of femur

Question 4

What is the origin and insertion of quadratus femoris?

Answer 4

Origin: Lateral border of ischial tuberosity
Insertion: Quadrate tubercle of femur and below

Question 5

What is the action and innervation of gemellus superior?

Answer 5

Action: Laterally rotates and stabilises the hip.
Innervation: Nerve to obturator internus

Question 6

What is the action and innervation of obturator internus?

Answer 6

Action: Laterally rotates and stabilises the hip.
Innervation: Nerve to obturator internus

Question 7

What is the action and innervation of gemellus inferior?

Answer 7

Action: Laterally rotates and stabilises the hip.
Innervation: Nerve to quadratus femoris

Question 8

What is the action and innervation of quadratus femoris?

Answer 8

Action: Laterally rotates and stabilises the hip.
Innervation: Nerve to quadratus femoris

Question 9

What does obturator internus pass through?

Answer 9

The lesser sciatic foramen