Muscles of the Hip Joint : Deep Lateral Rotator Group

Question 1

What are the muscles in the deep lateral rotator group?

Answer 1

1. Piriformis
2. Superior Gemellus
3. Obturator Internus
4. Inferior Gemellus
5. Obturator Externus
6. Quadratus Femoris

Question 2

What is the origin, insertion and actions of Piriformis?

Answer 2

O : Anterior Sacrum
I : Greater trochanter of the femur
A :
1. Laterally rotates the thigh at the hip joint
2. Horizontally extends (abducts) the thigh at the hip joint
3. Medially rotates the thigh at the hip joint

Question 3

What is the action of superior gemellus?

Answer 3

Laterally rotates the thigh at the hip joint

Question 4

What is the action of obturator internus?

Answer 4

Laterally rotates the thigh at the hip joint

Question 5

What is the action of inferior gemellus?

Answer 5

Laterally rotates the thigh at the hip joint

Question 6

What is the action of obturator externus?

Answer 6

Laterally rotates the thigh at the hip joint

Question 7

What is the origin, insertion and action of quadratus femoris?

Answer 7

O : Ischial Tuberosity
I : Intertrochanteric Crest of Femur
A : Laterally rotates the thigh at the hip joint