Gluteus Maximus Muscle, Posterior View

Description

Dominating the posterior hip, the gluteus maximus forms the bulk of the buttock as a broad, quadrilateral muscle spanning from the posterior ilium and dorsal surface of the sacrum and coccyx toward the proximal femur. Superomedially it borders the midline over the sacrum, while inferolaterally it drapes toward the gluteal fold and the posterior thigh. The left and right gluteus maximus masses meet near the intergluteal cleft, with their fibers running inferolaterally across the hip to insert into the iliotibial tract and the gluteal tuberosity of the femur. Big muscle. In a full-body posterior context, the contour of the buttock relates superiorly to the lumbar region and inferiorly to the hamstring compartment of the thigh. Posterior orientation matters because it clarifies the gluteus maximus as the primary hip extensor and a major external rotator, actions that become clinically obvious when rising from a chair, climbing stairs, or sprinting. This view also sets the stage for discussing adjacent deep structures that clinicians must respect even when they are not visible, including the sciatic nerve emerging inferior to piriformis and the superior and inferior gluteal neurovascular bundles traversing the greater sciatic foramen. Injection technique and surgical approach hinge on these relationships, with the superolateral quadrant of the gluteal region favored for intramuscular injections to reduce the risk of sciatic nerve injury. Use this plate for gross anatomy lab teaching on the gluteal region, for biomechanics chapters covering hip extension torque and gait, or for clinical training materials on safe gluteal IM injection sites and posterior hip exposures. It also fits rehabilitation and sports medicine content on gluteal weakness, compensatory lumbar extension, and functional testing such as the single-leg sit-to-stand. Anatomical accuracy verified by SciePro's Medical Advisory Board.