GROSS ANATOMY

Detailed explanation-1: -The superior gluteal nerve is responsible for innervation of the gluteus medius, gluteus minimus, and tensor fasciae latae muscles. The nerve exits the pelvis through the greater sciatic foramen superior to the piriformis muscle and accompanies the superior gluteal artery and vein.

Detailed explanation-2: -The superior gluteal nerve supplies motor function to the abductors of the hip, while the inferior gluteal nerve innervates the gluteus maximus.

Detailed explanation-3: -The piriformis muscle has its origin upon the front surface of the sacrum, and inserts onto the greater trochanter of the femur. Depending upon the given position of the leg, it acts either as external (lateral) rotator of the thigh or as abductor of the thigh. It is innervated by the piriformis nerve.

Detailed explanation-4: -It originates from the outer lip of the anterior iliac crest and the anterior superior iliac spine. It then runs distally to insert on the fascia lata. The tensor fasciae latae, together with the gluteus maximus muscle and the gluteal aponeurosis, form a horizontal band known as the iliotibial tract.