Piriformis muscle

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The piriformis muscle, also called the pyramidal pelvic muscle, belongs to the thigh and pelvis region. The piriformis muscle begins in the sacrum, passes through the buttocks, and ends at the femur. The piriformis muscle is located in the pelvis between the viscera and the upper leg. The piriformis nerve and sacral and gluteal arteries pass through the piriformis muscle. The piriformis allows for the separation and rotation of the thighs outwardly toward the sides.