Main Model
42 Piriformis muscle
Piriformis
Proximal Attachment: Anterior surface of sacrum; sacrotuberous ligament
Distal Attachment: Superior border of greater trochanter of femur
Innervation: Branches of anterior rami of S1, S2
Main Action(s): Laterally rotates extended thigh and abducts flexed thigh; steadies femoral head in acetabulum