Biceps Femoris

Question 1

What is it?

Answer 1

Hamstring group. Lateral posterior thigh hamstring. Long head and short head.

Question 2

Origin

Answer 2

The ischial tuberosity (long head), and the lateral lip at the linea aspera of the femur (short head)

Question 3

Insertion

Answer 3

Head of the fibula

Question 4

Innervation

Answer 4

Sciatic nerve.
(Long head is tibial branch; short head is fibular branch).

Question 5

Actions

Answer 5

-Flex the knee at tibiofemoral joint.
-Extend the hip at coxal joint.
-Tilt the pelvisposteriorly at the lumbosacral joint.
-Laterally rotate the flexed knee at tibiofemoral joint in the hip at coxal joint.