Muscles of the Pelvis and Gluteal : Lateral Rotators

Question 1

Piriformis

Answer 1

O : Anterior surface of the sacrum and anterior surface of sacrotuberous ligament
I : Superior medial aspect of the greater trochanter
A :
1. Laterally rotate the thigh at the hip joint
2. Horizontally extends the thigh at the hip joint

Question 2

Superior Gemellus

Answer 2

O : Ischial spine
I : Medial surface of the greater trochanter of the femur
A : Laterally rotates the thigh at the hip joint

Question 3

Obturator Internus

Answer 3

O : Internal surface of the margin of the obturator foramen, the obturator membrane, the ischium, pubis and ilium
I : Medial surface of the greater trochanter
A : Laterally rotates the thigh at the hip joint

Question 4

Inferior Gemellus

Answer 4

O : Superior aspect of the ischial tuberosity
I : Medial surface of the greater trochanter of the femur
A : Laterally rotates the thigh at the hip joint

Question 5

Obturator Externus

Answer 5

O : External surface of the margin of the obturator foramen on the ischium and pubis and obturator membrane
I : Trochanteric fossa of the femur
A : Laterally rotates the thigh at the hip joint

Question 6

Quadratus Femoris

Answer 6

O : Lateral border of the ischial tuberosity
I : Intertrochanteric crest
A : Laterally rotates the thigh at the hip joint