Origin

Arises from the lateral lip of the linea aspera, between the adductor magnus and vastus lateralis, extending up almost as high as the insertion of the gluteus maximus; from the lateral prolongation of the linea aspera to within 5 cm. of the lateral condyle; and from the lateral intermuscular septum.

Insertion

The head of the fibula which articulates with the back of the lateral tibial condyle

Action(s)

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

Nerve Supply

Common peroneal nerve

Arterial Supply

Inferior gluteal artery, perforating arteries, popliteal artery

Physical Exam

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Clinical Importance

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Disease States

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Discussion

The short head may be absent; additional heads may arise from the ischial tuberosity, the linea aspera, the medial supracondylar ridge of the femur, or from various other parts.

A slip may pass to the gastrocnemius

Figures

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Credits:

From Wikipedia:
Biceps femoris

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