Posteriorly, the gluteal region corresponds to the gluteus maximus. The gluteus maximus is the largest and most superficial of the three gluteal muscles. The gluteus medius, one of the three gluteal muscles, is a broad, thick, radiating muscle. These anastomoses exist between the femoral artery or profunda femoris and the gluteal vessels. This exercise requires an intense contraction of the gluteal, abdominal and latissimus muscles. This requires an intense contraction of the gluteal, abdominal and latissimus muscles. The piriformis () is a muscle in the gluteal region of the lower limbs. Tensor fasciae latae is innervated by the superior gluteal nerve, L5 and S1. Middle gluteal&colon; originates on the ilium and inserts on the greater trochanter. Endoscopic treatment for sciatic nerve entrapment has been investigated in deep gluteal syndrome. Deep gluteal&colon; originates on the ischiatic spine and inserts on the greater trochanter. It is innervated by the caudal gluteal nerve. It is innervated by the cranial gluteal nerve. A unique symptom of lathyrism is the atrophy of gluteal muscles (buttocks). The bulk of the gluteal muscle mass contributes only partially to shape of the buttocks.