what does the piriformis muscle do
Piriformis. The piriformis is a flat, pyramid-shaped muscle that lies parallel to (in line with) the gluteus medius muscle's back margin and underneath the gluteus maximus muscle in the hip area.t takes up the most area in the greater sciatic foramen. It is a small muscle when compared to other muscles of the region. The piriformis helps rotate the hip and works with rotators such as the obturator externus and the gemellus inferior.