In , while giving birth to her son, Nancy Norton received a fourth-degree laceration of her external sphincter muscle. Since that injury, Norton has managed her own fecal incontinence-the involuntary leaking of stool. Fecal incontinence is the inability to control bowel movements. The condition can range from an occasional leakage of stool while passing gas to a complete loss of bowel control. Healthy bowel function is controlled by rectal sensation, rectal accommodation, and anal sphincter muscles. A malfunction in one or more of these things may result in fecal incontinence.
Disorders of the Rectum and Anus in Dogs
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They're not the stuff of dinner party conversations, but knowing how to spot a problem could save your dog a lot of misery. Picture the scene. You've just washed your dog from top to tail using the finest shampoo and conditioner money can buy, but even after drying him, the same horrible fishy odour you noticed pre-groom is still lingering in your poor nostrils. Sound familiar? Anal glands or anal sacs are relatively small glands found on either side of your dog's anal opening. Not present in humans, they are paired sacs located precisely just below the surface of the skin between the external and internal sphincter muscles, employed by nature to produce a particularly thick, foul smelling, oily liquid secreted by glandular tissue for identification and territory marking. This is the reason dogs smell other dogs' bottoms when they meet and greet, standing tense with tails erect to swap their own unique smells rather like individual fingerprints.
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The bowel is the last portion of your digestive tract and is sometimes called the large intestine or colon. The digestive tract as a whole is a hollow tube that extends from the mouth to the anus. The function of the digestive system is to take food into the body and to get rid of waste.
The internal anal sphincter , IAS , or sphincter ani internus is a ring of smooth muscle that surrounds about 2. Its action is entirely involuntary , and it is in a state of continuous maximal contraction. It helps the Sphincter ani externus to occlude the anal aperture and aids in the expulsion of the feces. Sympathetic fibers from the superior rectal and hypogastric plexuses stimulate and maintain internal anal sphincter contraction.