The gemellus superior and gemellus inferior help to laterally rotate the extended thigh.
2.
Like the obturator internus muscle, the gemellus superior and gemellus inferior help to steady the femoral head in the acetabulum.
3.
The Gemellus inferior arises from the upper part of the tuberosity of the ischium, immediately below the groove for the Obturator internus tendon.
4.
The posterior side of the hip exhibits primarily hip extension, dealing with the muscles : gluteus maximus, hamstring muscles ( biceps femoris, semitendinosus, semimembranosus ), and the six deep external rotators ( piriformis, obturator externus, obturator internus, gemellus superior, gemellus inferior, and quadrates femoris ).
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