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Iliococcygeus muscle

German: Musculus iliococcygeus

1 Definition

The iliococcygeus muscle refers to the lateral part of the musculus levator ani which belongs to pelvic diaphragm.

2 Anatomy

The pelvic diaphragm (diaphragma pelivs) is the inner muscle layer which consists of the musculus levator ani (M. puborectalis, M. pubococcygeus, M. iliococcygeus) and (depending on the author) the musculus cocygeus. The Musculus coccygeus connects up to the musculus levator ani from behind and is grown together with the ligamentum sacrospinale.

The iliococcygeus muscle is generally just a thin muscle which can be missing completely or largely replaced by connective tissue.

3 Origin

The iliococcygeus muscle originates from the inner side of the os ischii and from the arcus tendineus musculi levatoris ani which is the tendinous arc of the obturatorius internus muscle's fascia.

4 Insertion

The iliococcygeus muscle inserts with its fibers in the ligamentum occygeum in the immediate vicinity to the coccyx.

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5 Innervation

The innervation is provided by the nervus pudendus which originates from the plexus sacralis (S2-S4).

6 Function

As a part of the musculus levator ani, the iliococcygeus muscle serves the lower sealing of the pelvis as well as the lifting respectively sealing of the anus. The lifting of the anus is an important supporting reaction in the context of defecation. With its tonicity the iliococcygeus muscle takes part in stabilizing the flexura perinealis, which belongs to the rectum. Consequently, the muscle is crucial for maintenance of fecal continence.

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