Biceps Femoris: Origin, Insertion, Action & Nerve Supply

Biceps Femoris:

The biceps femoris muscle has two heads – a long head and a short head.
Biceps Femoris is the most lateral of the muscles in the posterior thigh – the common tendon can be felt laterally at the posterior knee.

biceps femoris Origin-Insertion

Attachments of the Biceps Femoris

Origin-The long head originates from the ischial tuberosity of the pelvis. The short head originates from the linea aspera on posterior surface of the femur
Insertion- the heads from a tendon, which inserts into the head of the fibula.

Function of the Biceps Femoris

The Main action is flexion at the knee. It also extends the leg at the hip and laterally rotates at the hip and knee.

Nerve Supply of the Biceps Femoris

Long head innervated by tibial part of the sciatic nerve, and the short head is innervated by common fibular part of the sciatic nerve.