Long Head Biceps Femoris

The long head Biceps femoris is one part of the biceps femoris muscle.

Anatomy of the long head Biceps femoris

The long head biceps femoris contains the important tibial nerve.

The long head Biceps femoris arises from the lower and inner impression on the back part of the tuberosity of the ischium. This is by a tendon common to it and the semitendinosus, and from the lower part of the sacrotuberous ligament.

The fibers of the long head form a fusiform belly, which passes obliquely downward and lateral ward across the sciatic nerve to end in an aponeurosis which covers the posterior surface of the muscle, and receives the fibers of the short head.

Functions of the Long Head Biceps Femoris

The long head Biceps femoris perform knee flexion and outwardly rotates the lower leg when the knee is bent.

Since the long head originates in the pelvis it is also involved in hip extension. The long head of the biceps femoris extends the hip as when beginning to walk.

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.

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