biceps femoris (muscle)
Definition: hamstring muscle of posterior compartment of thigh; origin, long head (caput longum) from tuberosity of ischium, short head (caput breve) from lower half of lateral lip of linea aspera; insertion, head of fibula; action, flexes knee and rotates the flexed leg laterally; nerve supply, long head, tibial, short head, fibular.
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