L7: Posterior Thigh Muscles

Question 1

Hamstrings

Biceps Femoris

Answer 1

Origin:
Long Head: Originates from the ischial tuberosity
Short Head: linea aspera and lateral supracondylar line of femur

Attachment:
Lateral side of head of fibula

Function:
primarily responsible for hip extension and knee flexion . It also plays a role in the lateral rotation of the hip.

Nerve Supply:
sciatic nerve, specifically its tibial division (long head) and fibular division (short head)

Question 2

Semitendinosus

Answer 2

Origin: the ischial tuberosity
Attachment: Posterior part of medial condyle of tibia

Function:
hip extension and knee flexion. It also plays a role in medial rotation of the hip.

Nerve Supply:
Innervated by the sciatic nerve, specifically its tibial division (L5-S2)

Question 3

Semimembranosus

Answer 3

Origin:
Also originates from the ischial tuberosity.

Attachment:
Superior part of medial surface of tibia

Function:
hip extension and knee flexion. It also plays a role in medial rotation of the hip.

Nerve Supply:
Innervated by the sciatic nerve, specifically its tibial division (L5-S2)