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Laboratory 14. Posterior Thigh and Popliteal Fossa
Step 6. Biceps Femoris Muscle

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On the lateral side of the posterior thigh and deep to the long head of biceps femoris muscle, identify the short head of biceps femoris muscle [probe; retractor holds the long head of the biceps femoris muscle]. This head of the biceps femoris muscle arises from the shaft of the femur. Therefore, it is not considered to be a part of the hamstrings group, because it does not attach to the ischial tuberosity and functions only at the knee. The short head of the biceps femoris muscle is innervated by the common peroneal division of the sciatic nerve.

Links and References:
Grant's: 5.34
Netter (1ed.): 472 (2ed.): 468
Rohen/Yokochi: 430 and 455