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puborectal muscle

n.
  1. The part of the elevator muscle of the anus that passes from the body of the pubis around the anus to form a muscular sling at the level of the anorectal junction. The puborectal muscle relaxes during defecation.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.