What are the three hamstring muscles ? it is Biceps femoris , Semitendinosus , Semimembranosus. Where is the hamstring muscle located? Right Behind your Thighs, The hamstrings are a group of four muscles located in the back of the thigh . They run from the pelvis down to the knee and help bend the knee and extend the hip. The hamstrings are quite susceptible to injury. Biceps femoris The biceps femoris is the muscle of the back thigh. it names says itself that it has two-part( Biceps- two head ). the long and short heads. Sometimes short head may be absent. The muscle's Blood supply is derived from the anastomoses of several arteries, the perforating branches of the profunda femoris artery, the inferior gluteal artery, and the popliteal artery. Biceps femoris ORIGIN: Biceps femoris Has two heads as it originates from two separate origins. the long head originates from the ischial tuberosity. the short head originates fr