Anal sphincter control

The human IAS has particular structural and functional characteristics. This smooth muscle constantly generates rhythmic electrical slow waves, but no action potentials. The slow waves are linked to calcium fluxes and both are essential for mechanical activity, i. The IAS is pharmacologically characterized by the presence of alpha excitatory and beta inhibitory adrenergic receptors. The myogenic activity of the IAS is enhanced by its extrinsic sympathetic innervation. Because the IAS ring cannot be completely closed, the anal mucosa and the haemorrhoidal plexuses fill the gap.
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Control of Motility in the Internal Anal Sphincter

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Strengthening Your Anal Sphincter: Why and How

During normal defecation the IAS relaxes. Historically, tone generation in gastrointestinal muscles was attributed to mechanisms arising directly from smooth muscle cells, ie, myogenic activity. However, slow waves are now known to play a fundamental role in regulating gastrointestinal motility and these electrical events are generated by the interstitial cells of Cajal. Recently, interstitial cells of Cajal, as well as slow waves, have also been identified in the IAS making them viable candidates for tone generation.
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Tightening Your Anal Sphincter

Fecal incontinence is the inability to control bowel movements, causing stool feces to leak unexpectedly from the rectum. Also called bowel incontinence, fecal incontinence ranges from an occasional leakage of stool while passing gas to a complete loss of bowel control. Common causes of fecal incontinence include diarrhea, constipation, and muscle or nerve damage.
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Nobody wants to talk about or even imagine it. But loss of bowel control — known as fecal incontinence — is a problem for millions of adults in the United States, especially women. It's socially isolating and takes away your dignity.
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