The external anal sphincter or sphincter ani externus is a flat plane of skeletal muscle fibers , elliptical in shape and intimately adherent to the skin surrounding the margin of the anus. In a considerable proportion of cases the fibers decussate in front of the anus, and are continuous with the superficial transverse perineal muscle. Posteriorly, they are not attached to the coccyx, but are continuous with those of the opposite side behind the anal canal. The upper edge of the muscle is ill-defined, since fibers are given off from it to join the levator ani.
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First Time User? Sign Up Now. Enroll now. Take advantage of advanced surgical procedures at our locations in Raleigh and Cary. Your anal sphincter is a ring of muscle that opens and closes at the bottom of your anus and plays a large role in controlling bowel function. When the muscle is damaged or weakened it can cause incontinence—accidental loss of stool. If your sphincter is damaged and requires surgical repair, your physician will outline your personalized treatment plan that may include complete sphincter repair sphincteroplasty or an implantation of a wire that stimulates your bowels sacral nerve stimulation.
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When a tubular organ or blood vessel becomes excessively narrow such that it can no longer perform as nature intended, it is a condition referred to by physicians as stenosis. Anal stenosis, also known as an anal stricture, is the narrowing of the anal canal, located just before the anal sphincter. The anal sphincter is a complex part of the body that maintains a seal that can be opened to discharge body waste. It is strong enough to restrict the passage of any fecal material but sensitive enough to differentiate between solid, liquid, and gas.
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