​The biceps femoris is a muscle of the posterior (the back) thigh. As its name implies, it has two parts, one of which (the long head) forms part of the hamstrings muscle group. ​

Action:

Both heads of the biceps femoris perform knee flexion.

Since the long head originates in the pelvis it is also involved in hip extension.

The long head of the biceps femoris is

a weaker knee flexor when the hip is extended (because of active insufficiency). For the same reason the long head is a weaker hip extender when the knee is flexed.

When the knee is semi-flexed, the biceps femoris in consequence of its oblique direction rotates the leg slightly outward.

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