Biceps Femoris definition

Part of the hip and thigh section of the body, the biceps femoris includes    the long head that extends from the ischial tuberosity. The short head comes from a line on the back of the femur that is positioned underneath the long head.  It is located at head of the fibula.    The biceps femoris is responsible for pulling the thigh backwards and bending the leg at the knee.