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Coccygeus muscle

Muscle of the lower back arising by its apex from the spine of the ischium

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Structure

The coccygeus muscle is posterior to levator ani and anterior to the sacrospinous ligament in the pelvic floor. It is a triangular plane of muscular and tendinous fibers. It arises by its apex from the spine of the ischium and sacrospinous ligament. It is inserted by its base into the margin of the coccyx and into the side of the lowest piece of the sacrum.

In combination with the levator ani, it forms the pelvic diaphragm.

The pudendal nerve runs between the coccygeus muscle and the piriformis muscle, superficial to the coccygeus muscle.

Nerve supply

The coccygeus muscle is innervated by the pudendal nerve, which runs between it and the piriformis muscle.

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