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The external anal sphincter consists of

Sign up. Illustrated anatomical parts with images from e-Anatomy and descriptions of anatomical structures. Description: The Sphincter ani externus External sphincter ani is a flat plane of muscular fibers, elliptical in shape and intimately adherent to the integument surrounding the margin of the anus. It measures about 8 to 10 cm. It consists of two strata, superficial and deep. The deeper portion forms a complete sphincter to the anal canal.
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Internal anal sphincter

The external anal sphincter consists of
The external anal sphincter consists of
The external anal sphincter consists of
The external anal sphincter consists of
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External anal sphincter | anatomy | TheAudiCars.com

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. 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. The action of this muscle is peculiar. Schematic demonstrating the anatomy of hemorrhoids. From Wikipedia, the free encyclopedia.
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External anal sphincter

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.
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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. 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.
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