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the muscles at the back of the thigh, comprising the long head of biceps, the semitendinosus, and the semimembranosus muscles; hamstring muscles ariose from ischial tuberosity, act across both hip and knee joints, and are innervated by the tibial nerve.The muscles of the posterior thigh, which consist of biceps femoris—laterally, and the semitendinosus and semimembranosus muscles—medially
hamstring muscles The three large muscles on the back of the thigh-the semimembranosus, the semitendinosus and the biceps femoris. These muscles arise from the lower back part of the pelvis and are inserted, by way of the HAMSTRINGS, into the back of the bone of the lower leg (the TIBIA). Contraction of the hamstring muscles bends the knee and straightens the hip joint.