"An accessory piriformis muscle, which is really accessory muscle slip(s), has been rarely described with considerable variability 5:"
"origin: anterolateral surface of the sacrum"
"course: exits the pelvis through the greater sciatic foramen"
"insertion: greater trochanter of the femur"
"action: abduction and lateral rotation of the thigh"
"arterial supply"
"innervation: nerve to piriformis (S1 and S2 nerve roots) from the sacral plexus"
"An accessory piriformis muscle, which is really accessory muscle slip(s), has been rarely described with considerable variability 5:"
Expected headings
"Origin"
"Course"
"Insertion"
"Action"
"passing inferiorly: inferior gluteal nerve and vessels; sciatic nerve; internal pudendal artery; pudendal nerve; posterior femoral cutaneous nerve; nerve to obturator internus; nerve to quadratus femoris"
"passing inferiorly: inferior gluteal nerve and vessels; sciatic nerve; internal pudendal artery; pudendal nerve; posterior femoral cutaneous nerve; nerve to obturator internus; nerve to quadratus femoris"
"passing inferiorly: inferior gluteal nerve and vessels; sciatic nerve; internal pudendal artery; pudendal nerve; posterior femoral cutaneous nerve; nerve to obturator internus; nerve to quadratus femoris"
"passing inferiorly: inferior gluteal nerve and vessels; sciatic nerve; internal pudendal artery; pudendal nerve; posterior femoral cutaneous nerve; nerve to obturator internus; nerve to quadratus femoris"
"passing inferiorly: inferior gluteal nerve and vessels; sciatic nerve; internal pudendal artery; pudendal nerve; posterior femoral cutaneous nerve; nerve to obturator internus; nerve to quadratus femoris"