This is one of the hamstring muscles (the others are the semimembranosus and semitendinosus) which are the group of muscles on the back of the thigh. They are primarily flexors of the knee joint but can also extend the hip joint. The biceps femoris (there is, of course, also a biceps in the upper limb, the biceps brachii) has one origin from the ischial tuberosity - as do the other hamstrings - and a second one from the linea aspera on the back of the femur. Biceps means "two heads". The muscle is attached below the knee to the head of the fibula. In arriving at its insertion, it wraps around the lateral (fibular) collateral ligament of the knee joint which is also attached to the head of the fibula. The biceps femoris is supplied by the sciatic nerve.
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