Description: The gemellus m. is composed of the inferior gemellus and superior gemellus. The superior gemellus orginates from the upper part of the lessor sciatic notch, near the ischial spine. The inferior gemellus m. originates from the lower part of the lessor sciatic notch, near the ischial tuberosity. Both insert on the greater trochanter of the femur. Innervation of the superior m. is from L5-S2 via the n. to the obturator internus, and that to the inferior is L4-S1 via the n. to the quadratus femoris m.