part of part of has muscle origin has muscle origin has muscle insertion has muscle insertion Homo sapiens gluteal muscle greater trochanter fused sacrum musculature of pelvic girdle piriformis muscle http://upload.wikimedia.org/wikipedia/commons/5/55/Posterior_Hip_Muscles_1.PNG piriformis muscle piriform muscle Wikipedia:Piriformis_muscle EMAPA:36239 FMA:19082 The piriformis is a muscle in the gluteal region that originates from the anterior (front) part of the sacrum, the part of the spine in the gluteal region, and from the superior margin of the greater sciatic notch (as well as the sacroiliac joint capsule and the sacrotuberous ligament). It exits the pelvis through the greater sciatic foramen to insert on the greater trochanter of the femur. Its tendon often joins with the tendons of the superior gemellus, inferior gemellus, and obturator internus muscles prior to insertion[WP,modified]. piriformis m.piriformis musculus piriformis SCTID:245019009 UBERON:0008529