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A weak anal sphincter is when the internal and or external anal sphincter muscles are weakened or damaged. The anal sphincters (internal and external) are rings of muscle at the opening of the anus. The sphincters keep the anus closed as stool gathers in the rectum. Ultimately the pressure on the rectum wall leads to the internal anal. The internal anal sphincter is an involuntary muscle, which means you cannot consciously control it. Similar to your beating heart and your diaphragm, this muscle does its job every second of the day without you having to think about its function. The internal sphincter is programmed to stay shut, which is why most adults do not leak stool while they sleep. Weakness around the anus, and this may lead to rectal prolapse or anal sphincter weakness. A rectal prolapse can occur when the normal support for the rectum becomes weak and the rectal lining (or even some of the rectum itself) starts to fall down through the anus. This is more likely to happen when straining to have a bowel movement. 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. The external anal sphincter measures about 8 to 10 cm in length, from its. Your internal sphincter is an involuntary muscle that wraps around your anus. You can develop abnormal weakness in either the internal or external sphincter for reasons that include age-related wear and tear,. Your doctor will place a specialized probe in your anus or place a sensing device called an electrode near your anal opening.