The gluteus maximus is the largest, most superficial muscle of the buttocks, crucial for hip extension, lateral rotation, and maintaining an upright posture. It originates on the ilium, sacrum, and coccyx, inserting into the iliotibial (IT) band and gluteal tuberosity of the femur. It is innervated by the inferior gluteal nerve (
) and supplied by the gluteal arteries.
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Key Anatomical Details
- Gluteus Maximus Action: Extends the thigh, assists in lateral rotation, and stabilizes the pelvis and knee, particularly during activities like climbing stairs or standing up from a seated position.
- Thigh Compartments: Muscles are divided into:
- Anterior: Primarily knee extensors (e.g., Quadriceps).
- Posterior: Hamstrings (Biceps femoris, Semitendinosus, Semimembranosus) which extend the hip and flex the knee.
- Medial: Adductors (Adductor longus, brevis, magnus, gracilis) which adduct the thigh.
- Gluteal Region Muscles:
- Superficial: Gluteus maximus, gluteus medius, gluteus minimus, and tensor fasciae latae.
- Deep: Lateral rotators, including the piriformis, gemelli, and obturator internus.
Neurovascular Supply: The gluteal region is supplied by the superior and inferior gluteal nerves/arteries. The posterior thigh is primarily managed by the sciatic nerve.
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Clinical Relevance
Weakness in the gluteus maximus can lead to difficulty standing up or climbing stairs, while dysfunction in the gluteus medius/minimus often causes a Trendelenburg gait