The piriformis is a flat, pyramid-shaped muscle of the gluteal region that lies deep to the gluteus maximus. It belongs to a group of six short external rotators of the hip: gemellus superior, obturator internus, gemellus inferior, obturator externus and quadratus femoris. It is the most superficial of these six muscles. This muscle is important for the stabilisation of the hip joint and moving the hip in multiple directions as it attaches from the sacrum on one end and to the greater trochanter of the hip at the other.<\/p>\n<\/div>