Gluteal Muscles

Question 1

Quadratus Femoris

Answer 1

Origin: Lateral border of ischial tuberosity

Insertion: Quadrate tubercle on intertrochanteric crest of femur

Action: Laterally rotates the thigh at the hip

Question 2

Gemelli: Super and Inferior

Answer 2

Origin: Superior - Ischial spine
Inferior - Ischial tuberosity

Insertion: Medial aspect of greater trochanter of femur

Action: Laterally rotate extended thigh at the hip and abduct flexed thigh at the hip; Steadies femoral head in the acetabulum

Question 3

Obturator Internus

Answer 3

Origin: Pelvic surface of obturator membrane and surrounding bones

Insertion: Medial aspect of greater trochanter of femur

Action: Laterally rotates extended thigh at the hip and abducts flexed thigh at the hip; Steadies femoral head at the acetabulum

Question 4

Piriformis

Answer 4

Origin: Anterior surface of sacrum and sacrotuberous ligament

Insertion: Superior border of greater trochanter

Action: Laterally rotates extended thigh at the hip and abducts flexed thigh at the hip; Steadies femoral head in acetabulum

Question 5

Gluteus Minimus

Answer 5

Origin: Lateral surface of ilium

Insertion: Anterior surface of greater trochanter

Actions: Abducts and medially rotates the thigh at the hip; Steadies the pelvis on the limb opposite the limb being raised

Question 6

Gluteus Medius

Answer 6

Origin: External surface of ilium

Insertion: Lateral surface of greater trochanter of femur

Action: Abducts and medially rotates thigh at the hip; Steadies pelvis on limb when opposite limb is raised

Question 7

Gluteus Maximus

Answer 7

Origin: Ilium posterior to posterior gluteal line, dorsal surface of sacrum and coccyx, and sacrotuberus ligament.

Insertion: Most fibres end in iliotibial tract that inserts into lateral epicondyle of tibia; some fibres insert on gluteal tuberosity of femur

Actions: Extends thigh at the hip and assists in its lateral rotation; Steadies thigh and assists in raising trunk from flexed position