Muscles - Posterior Thigh

Question 1

Semitendinosus

Answer 1

O - Ischial tuberosity
I - Pes anserinus
NS - Tibial part of sciatic nerve (L5-S2)
A - Extends thigh, flexes knee and medially rotates leg when knee is flexed, extend trunk when leg is fixed

Question 2

Semimembranosus

Answer 2

O - Ischial tuberosity
I - Posterior aspect of medial tibial condyle and oblique popliteal ligament
NS - Tibial part of sciatic nerve (L5-S2)
A - Extends thigh, flexes knee and medially rotates leg when knee is flexed, extend trunk when leg is fixed

Question 3

Biceps Femoris (Long head)

Answer 3

O - Ischial tuberosity
I - Lateral side of fibular head
NS - Tibial division of sciatic nerve (L5-S2)
A - Extend thigh, flexes knee and laterally rotates leg when knee is flexed

Question 4

Biceps Femoris (Short head)

Answer 4

O - Linea aspera and lateral supracondylar line of femur
I - Lateral side of fibular head
NS - Common fibulrar division of sciatic nerve (L5-S2)
A - Extend thigh, flexes knee and laterally rotates leg when knee is flexed