biceps femoris flexor or extensor

Introduction: Biceps femoris is the long muscle of the posterior aspect of the thigh. Together with the semitendinosus & semimembranosus muscles, it makes the group of muscles commonly known as the hamstrings. Biceps femoris muscle runs from the ischial tuberosity, all the way to the proximal portion of the fibula. In doing so the muscle…