Posterior

Question 1

What muscle is responsible for abducting the thigh and rotating it medially?

Answer 1

Gluteus medius

Origin: Lateral surface of ilium; Insertion: Greater trochanter of femur

Question 2

What is the origin of the Gluteus minimis?

Answer 2

Lateral surface of ilium

Insertion: Greater trochanter of femur; Action: Abducts thigh, rotates thigh medially

Question 3

Which muscle has its origin at the ischial tuberosity and is responsible for extending the thigh at the hip?

Answer 3

Biceps femoris (long head)

Also flexes leg at knee and rotates leg laterally

Question 4

What is the action of the Semitendinosus muscle?

Answer 4

Extends thigh at hip, flexes leg at knee, rotates leg medially

Origin: Ischial tuberosity; Insertion: Medial tibia

Question 5

Fill in the blank: The _______ is responsible for rotating the thigh laterally when the hip is extended.

Answer 5

Quadratus femoris

Origin: Ischial tuberosity; Insertion: Intertrochanteric crest of the femur

Question 6

What is the function of the Piriformis muscle?

Answer 6

Rotates thigh laterally

Origin: Lateral surface of sacrum; Insertion: Greater trochanter of femur

Question 7

True or False: The Semimembranosus muscle rotates the leg laterally.

Answer 7

False

It rotates the leg medially.

Question 8

What are the two actions of the Biceps femoris (short head)?

Answer 8

Flexes leg at knee, rotates leg laterally

Origin: Linea aspera; Insertion: Head of fibula