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internal sphincter muscle of anus

internal sphincter muscle of anus in Medicine

internal sphincter muscle of anus n.
A smooth muscle ring formed by an increase of the circular fibers of the rectum, situated at the upper end of the anal canal.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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