[Muscles] Posterior compartment of the thigh

Question 1

Biceps femoris

Answer 1

O: LH - inferomedial part of upper ischial tuberosity
SH - lateral lip linea aspera of femur
Ins: head of fibula
Inn: sciatic N
Bs: Deep femoral A
Action: Flex leg, lateral rotation of leg at knee
Extend thigh, lateral rotation of thigh at knee.

Question 2

Semitendinosus

Answer 2

O: inferomedial part of upper area of ischial tuberosity
Ins: Medial surface of proximal tibia
Inn: Sciatic N
Bs: Deep femoral A
Action: Flex leg, Medially rotate leg at knee
Extend thigh, medially rotate thigh at knee

Question 3

Semimembranosus

Answer 3

O: superolateral impression on ischial tuberosity
Ins: posterior surface of medial tibial condyle
Inn: Sciatic N
Bs: Deep femoral A
Action: Flex leg, medially rotate leg at knee.
Extend thigh, medially rotate thigh at knee.