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Anus internal muscle sphincter

The rectum is a muscular tube about 13 cm 5 in. The rectum connects the colon to the anus, which is the opening where stool exits the body. The internal and external anal sphincters are rings of muscle at the opening of the anus. The sphincters keep the anus closed as stool collects in the rectum. Eventually the pressure on the rectum wall causes the internal anal sphincter to relax. Conscious control over the external anal sphincter allows stool to pass out of the body through the anus.
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Internal anal sphincter

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Internal anal sphincter - Wikipedia

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. Its contraction is inhibited by parasympathetic fiber stimulation.
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Rectum, Anus, and Anal Sphincter

NCBI Bookshelf. During a bowel movement, the indigestible parts of our food leave our body. These are embedded in the pelvic floor muscles. The rectum, which is about 20 centimeters long, is the final section of the large intestine colon.
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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.
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