The gluteal muscles can be divided into two main groups: Large and superficial muscles which mainly abduct and extend the thigh at the hip joint. These are the gluteus maximus, gluteus medius, gluteus minimus, and tensor fasciae latae. Small and deep muscles which mainly externally rotate the thigh at the hip joint and stabilise the pelvis. These are the piriformis, obturator internus, obturator externus, gemellus superior, gemellus inferior, and quadratus femoris. They are also known as the inn