Accessory muscular bundles arising from biceps femoris muscle.

Two kinds of accessory muscle bundles arising from the long head of the biceps femoris muscle were encountered in a 20-year-old Turkish female cadaver during routine dissections. The one occurred on both sides, each arising from the lower portion of the long head of the muscle and passed deep to the fascia of the popliteal fossa to be inserted into the crural fascia. The other one which was observed only on the right side, arose from the upper portion of this head to be inserted into the semitendinosus muscle.