Muscle Atlas


Origin: Anterior surface of lateral process of sacrum and gluteal surface of ilium at the margin of the greater sciatic notch
Insertion: Superior border of greater trochanter
Action: Lateral rotator of the hip joint; also helps abduct the hip if it is flexed
Innervation: Piriformis nerve (L5, S1, S2)
Arterial Supply: Superior and inferior gluteal and internal pudendal arteries

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