Puborectalis muscle
| Puborectalis muscle | |
|---|---|
 The posterior aspect of the rectum exposed by removing the lower part of the sacrum and the coccyx. (Puborectalis not labeled, but levator ani labeled at bottom right, and external anal sphincter labeled at bottom center.) | |
 Left Levator ani from within. (Puborectalis not labeled, but 'levator ani' labeled at center, and anal canal labeled at bottom center.) | |
| Details | |
| Origin | lower part of the pubic symphysis, superior fascia of the urogenital diaphragm |
| Nerve | S3, S4. levator ani nerve[1] |
| Actions | inhibit defecation |
| Identifiers | |
| Latin | musculus puborectalis |
| TA | A04.5.04.007 |
| FMA | 19091 |
The fibers which form a sling for the rectum are named the Puborectalis.
They arise from the lower part of the pubic symphysis, and from the superior fascia of the urogenital diaphragm.
They meet with the corresponding fibers of the opposite side around the lower part of the rectum, and form for it a strong sling. Relaxation increases the angle between rectum and anus, allowing defecation in conjunction with relaxation of the internal and external anal sphincters.
Puborectalis is part of the levator ani muscle.
References
- ↑ Wallner C, Maas C, Dabhoiwala N, Lamers W, Deruiter M (2006). "Evidence for the innervation of the puborectalis muscle by the levator ani nerve.". Neurogastroenterol Motil. 18 (12): 1121–2. doi:10.1111/j.1365-2982.2006.00846.x. PMID 17109696.
External links
- pelvis at The Anatomy Lesson by Wesley Norman (Georgetown University)
- Anatomy photo:43:16-0200 at the SUNY Downstate Medical Center - "The Female Pelvis: Muscles of the Pelvic Diaphragm"
- Anatomy photo:44:12-0200 at the SUNY Downstate Medical Center - "The Male Pelvis: Muscles of the Pelvic Diaphragm"
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