Coccygeus muscle
The Coccygeus or ischiococcygeus is a muscle of the pelvic floor, located posterior to levator ani and anterior to the sacrospinous ligament.
| Coccygeus muscle | |
|---|---|
 Left Levator ani from within. | |
| Details | |
| Origin | Sacrospinous ligament and ischial spine |
| Insertion | Lateral margin of coccyx and related border of sacrum |
| Nerve | Pudendal nerve; sacral nerves: S4, S5[1] or S3-S4[2] |
| Actions | pulls coccyx forward after defecation, closing in the back part of the outlet of the pelvis |
| Identifiers | |
| Latin | musculus coccygeus |
| TA98 | A04.5.04.011 |
| TA2 | 2412 |
| FMA | 19088 |
| Anatomical terms of muscle | |
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.
References
This article incorporates text in the public domain from page 424 of the 20th edition of Gray's Anatomy (1918)
- Essential Clinical Anatomy. K.L. Moore & A.M. Agur. Lippincott, 2 ed. 2002. Page 217
- "uams.edu". Retrieved 2007-12-09.
External links
- Anatomy photo:43:16-0103 at the SUNY Downstate Medical Center - "The Female Pelvis: Muscles of the Pelvic Diaphragm"
- Cross section image: pelvis/pelvis-e12-15—Plastination Laboratory at the Medical University of Vienna
- pelvis at The Anatomy Lesson by Wesley Norman (Georgetown University) (femalepelvicdiaphragm, malepelvicdiaphragm)
- Coccyx pain, tailbone pain, coccydynia (Peer-reviewed medical chapter, available free online at eMedicine)
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