The hamstring, gemellus, obturator, piriformis, and quadratus femoris muscles are all in the posterior group of muscles that move the femur.

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These muscles are all located in the posterior compartment of the thigh or in the gluteal region and are involved in the movement of the femur, primarily in extension, lateral rotation, and stabilization of the hip joint.

The Hamstring, Gemellus, Obturator, Piriformis, and Quadratus Femoris Muscles Are