Sphincter muscle: Sphincter muscle, any of the ringlike muscles surrounding and able to contract or close a bodily passage or opening. One of the most important human sphincter muscles is the sphincter pylori, a thickening of the middle layer of stomach muscle around the pylorus (opening into the small intestine)

Obstetric anal sphincter injuries can be associated with significant short and long term consequences causing devastating impacts on the quality of …

Jun 07, 2017 · A fistula-in-ano is an abnormal tract or cavity with an external opening in the perianal area that is communicating with the rectum or anal …

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Other articles where Internal anal sphincter is discussed: anal canal: The internal sphincter is part of the inner surface of the canal; it is composed of concentric layers of circular muscle tissue and is not under voluntary control.

Anatomy. The external anal sphincter measures about 8 to 10 cm in length, from its anterior to its posterior extremity, and is about 2.5 cm opposite the anus, when defecation occurs the sphincter muscle retracts.

Continued From Above Gross Anatomy. The intestines are located inferior to the stomach in the abdominal body cavity. They are connected to the posterior wall of the abdomen by the mesentery, a thin vascular membrane.

This module covers the basic anatomy and physiology of the anus and rectum as a prelude to anal sex and anal play.

The anal glands or anal sacs are small glands found near the anus in many mammals, including s and cats.They are paired sacs located on either side of the anus between the external and internal sphincter muscles.

Dec 15, 2017 · A thorough knowledge of the anatomy of the anal canal is vital for effective surgical treatment of an anal fissure.