Origin: the outer surface of the spine of the ischium
Insertion: the posterior medial surface of the greater trochanter on the femur;
Action: external rotation of the femur at the hip;
Nerve Supply: sacral plexus, L5, S1, S2; (see innervation)
Synergists: piriformis, obturator externus, obturator internus, quadratus femoris, gemeluus inferior