| Coccygeus muscle | |
|---|---|
| Left Levator ani from within. | |
| Latin | musculus coccygeus |
| Gray's | subject #119 424 |
| Origin | Sacrospinous ligament and ischial spine |
| Insertion | Lateral margin of coccyx and related border of sacrum |
| Artery | |
| Nerve | sacral nerves: S4, S5 [1][2] or S3-S4[3] |
| Actions | pulls coccyx forward after defecation, closing in the back part of the outlet of the pelvis |
The Coccygeus is a muscle of the pelvic wall (i.e. peripheral to the pelvic floor), located posterior to levator ani and anterior to the sacrospinous ligament.
It is a triangular plane of muscular and tendinous fibers, arising by its apex from the spine of the ischium and sacrospinous ligament, and 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.
It assists the levator ani and piriformis in closing in the back part of the outlet of the pelvis.
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.
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