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An anal sphincter is a group of muscles at the end of the rectum that surrounds the anus and controls the release of stool, thereby maintaining continence. There are two sphincter muscles: one is internal and one is external. The external muscle helps maintain continence and keep stool in the rectum. If there is a loss of muscle control in the sphincter, incontinence may occur. The inner muscle is not under voluntary control but rather is controlled by the autonomic nervous system. The external sphincter can be voluntarily controlled, meaning it can be clenched and unclenched.
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Anal sphincter | Definition of Anal sphincter at powerlinesafety.info

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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.
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Most Liked Posts. MuscledHorse Well-Known Member. You're rectom area has the two sphincters but you will also notice it has be bend to it. This can be straightened out over time as you take bigger and longer stuff in you.
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