Posterior Thigh: Extensors of Hip & Flexors of Knee

Question 1

Semitendinosus

Answer 1

O: Ischial tuberosity

I: Superior part of medial surface
of tibia

I: Sciatic nerve (tibial division) (L5, S1, S2)

B: Perforating branch of profunda femoris and
medial circumflex femoral arteries

A: Flexes leg, extends thigh

Question 2

Semimembranosus

Answer 2

O: Ischial tuberosity

I: Posterior part of medial condyle of tibia

I: Sciatic nerve (tibial division) (L5, S1, S2)

B: Perforating branch of profunda femoris and
medial circumflex femoral arteries

A: Flexes leg, extends thigh

Question 3

Biceps femoris

Answer 3

O: Long head: ischial tuberosity
Short head: Linea aspera and lateral supracondylar line of femur

I: Lateral side of head of fibula

I: Long head:
sciatic nerve (tibial division) (L5–S2)
Short head:
sciatic nerve (common fibular division) (L5, S1, S2)

B: Perforating branches of profunda femoris, inferior gluteal, and medial circumflex femoral arteries

A: Flexes and laterally rotates leg, extends thigh at hip