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other articles where external anal sphincter is discussed anal canal the external sphincter is a layer of voluntary (striated) muscle encircling the outside wall of the anal canal and anal opening. One can cause it to expand and contract at will, except during the early years of life when it is not yet fully developed. There are several a handful of products that claim to either relax or desensitize the anal sphincter muscle. Adventure and daring sprays (by intimate organics), apronal anal spray and mr. Exercise your anal sphincter muscles -- the sphincter ani internus, ani externus, and the internal and external anal sphincters -- by squeezing and tightening the anus while sitting, lying down or standing. Feel the contraction as you squeeze the anal sphincter, but keep your other pelvic floor muscles and the urinary sphincter relaxed. 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. Not to mention the complications of anal fissures, only its pain can make you never wish to experience it once. Therefore, it is imperative to apply some prevention tips so that you can avoid this problem as much as possible, in addition to top home remedies for anal fissures. Fecal incontinence is a common problem after anal sphincter-preserving operations. The intersphincteric autonomic nerves supplying the internal anal sphincter (ias) are formed by the union of (1) nerve fibers from auerbachs nerve plexus of the most distal part of the rectum and (2) the inferior rectal branches of the pelvic plexus (irb-px) running along the conjoint longitudinal muscle coat. They contribute to 1520 of anal closure pressure at rest and protect the internal and external anal sphincter muscles during the passage of stool. When a person bears down, the intra-abdominal pressure grows, and hemorrhoid cushions increase in size, helping maintain anal closure.