Dictionary of Human Evolution and Biology

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Anterior Inferior Iliac Spine

Protrusion of the anterior coxal bone below the greater sciatic notch and superior to the lesser sciatic notch; it serves as a site of attachment for the straight head of the rectus femoris, a muscle important in erect bipedal locomotion and unsupported erect standing. A well-defined iliac spine indicates development of this muscle and suggests bipedalism.

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