Gluteus maximus is the largest muscle of human body. It lies superficial in the gluteal region and is largely responsible for the prominence of buttock.
Origin of gluteus maximus:
It originates from the following parts:
- Outer surface of ilium
- Posterior surface of sacrum and coccyx
- Sacrotuberous ligament
Insertion of gluteus maximus:
The fibers of the muscle pass downward and laterally to be inserted into the iliotibial tract. Some of the deeper fibers are inserted into the gluteal tuberosity of the femur.
Nerve supply of gluteus maximus:
It receives its nerve supply from the inferior gluteal nerve.
Action of gluteus maximus:
It extends and laterally rotates the hip joint. Another major action of the gluteus maximus is that it helps maintain the knee joint in extension. Most commonly, the gluteus maximus is used as an extensor of the trunk on the thigh, for instance in raising the trunk from sitting or stooping position.
Bursae associated with gluteus maximus:
Three bursae are usually associated with gluteus maximus muscle. First lies between the tendon of insertion of gluteus maximus and greater trochanters. Second lies between the tendon of insertion and greater trochanters of femur. Third lies between tendon of insertion and vastus lateralis muscle.