Dictionary of Human Evolution and Biology

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Gluteus Maximus

Muscle that moves the thigh. The gluteus maximus originates from the sacrum, coccyx, and posterior surface of the ilium and inserts into the gluteal tuberosity of the femur and the iliotibial tract, a thick tendinous region of fascia that extends down the thigh. Its action is to extend the thigh forcefully, as when returning it from its flexed position during climbing or running (when the thigh is strongly flexed), but is generally inactive during normal walking; largest muscle of the body, In contrast, it is not as well developed in quadrupeds (including chimpanzees).

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