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The external anal sphincter consists of

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 anterior to its posterior extremity, and is about 2. In a considerable proportion of cases the fibers decussate in front of the anus, and are continuous with the superficial transverse perineal muscle. Posteriorly, they are not attached to the coccyx, but are continuous with those of the opposite side behind the anal canal. The upper edge of the muscle is ill-defined, since fibers are given off from it to join the levator ani. This article incorporates text in the public domain from page of the 20th edition of Gray's Anatomy
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Anal Sphincter: Function, Anatomy, Complications

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Anal Sphincter: Function, Anatomy, Complications

Since anal sphincters are used as the continent sphincters in some urologic operations, a study of their anatomic structure and function seems necessary. The anatomy of the external anal sphincter has been studied in 18 cadavers by dissection and serial histologic sections. The muscle has been found to consist of a series of U-shaped loops which are distinguishible as three main "loops": top, intermediate, and base. The puborectalis and the deep portion of the external sphincter have been found to be one muscle which is given the name "top loop.
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External anal sphincter

Jump to content. Your digestive system is made up of a series of organs that allows your body to get the nutrients and energy it needs from the food we eat. As food travels through the digestive system it is broken down, sorted, and reprocessed before being circulated around the body to nourish and replace cells and supply energy to our muscles.
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The bowel is part of our digestive system and it works to digest the food we eat, absorb the goodness and nutrients into our blood stream, then process and expel the waste that the body cannot use. The digestive system works by pushing food through the intestines which usually takes between 24 to 72 hours. Muscular contractions squeeze peristalsis the food through the different sections of the intestine.
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