Outer surface of ilium behind posterior gluteal line, adjacent posterior surface of sacrum and coccyx, sacrotuberous ligament, aponeurosis of erector spinae (sacrospinalis)
Iliotibial tract of fascia lata, gluteal tuberosity of femur
Upper part—abducts, laterally rotates thigh Lower part—extends, laterally rotates thigh, extends trunk, assists in adduction of thigh
Inferior gluteal nerve (L5, S1, S2)
This is not a postural muscle; it is not used in walking but only in forceful extension, as in running, climbing, or rising from a seated position.