Posterior Thigh Muscles

Question 0

Semimembranosus

Answer 0

Origin: Ischial tuberosity

Insertion: Posterior part of medial condyle of tibia; reflected attachment forms oblique popliteal ligament (to lateral femoral condyle)

Innervation: Tibial division of sciatic nerve (L5, S1, S2)

Question 1

Semitendinosus

Answer 1

Origin: Ischial tuberosity

Insertion: Medial surface of superior part of tibia

Innervation: Tibial division of sciatic nerve (L5, S1, S2)

Question 2

Biceps femoris, long and short heads

Answer 2

Origin: (long head) ischial tuberosity, (short head) linea aspera and lateral supracondylar line of femur

Insertion: Lateral side of head of fibula; tendon is split at this site by fibular collateral ligament of knee

Innervation: (long head) tibial division of sciatic nerve (L5, S1, S2); (short head) common fibular division of sciatic nerve (L5, S1, S2)