Puborectalis muscle

Puborectalis muscle

Infobox Muscle
Latin = musculus puborectalis
GraySubject = 119
GrayPage = 424

Caption = 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 sphincter ani ext labeled at bottom center.)

Caption2 = Left Levator ani from within. (Puborectalis not labeled, but 'levator ani' labeled at center, and anal canal labeled at bottom center.)
Origin = lower part of the symphysis pubis, superior fascia of the urogenital diaphragm
Insertion =
Blood =
Nerve = S3, S4. levator ani nerve [cite journal | author = Wallner C, Maas C, Dabhoiwala N, Lamers W, Deruiter M | title = Evidence for the innervation of the puborectalis muscle by the levator ani nerve. | journal = Neurogastroenterol Motil | volume = 18 | issue = 12 | pages = 1121–2 | year = 2006 | pmid = 17109696 | doi = 10.1111/j.1365-2982.2006.00846.x]
Action = inhibit defecation
Antagonist =
DorlandsPre = m_22
DorlandsSuf = 12550328
The fibers which form a sling for the rectum are named the Puborectalis or Sphincter recti.

They arise from the lower part of the symphysis pubis, 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 reduces the angle between rectum and anus, allowing defecation in conjunction with relaxation of the internal and external sphincters.

Puborectalis is part of the levator ani group of muscles.


External links

* - "The Female Pelvis: Muscles of the Pelvic Diaphragm"
* - "The Male Pelvis: Muscles of the Pelvic Diaphragm"

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