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deep transverse muscle of perineum

n.
  1. A muscle with origin from the ramus of the ischium, with insertion with its fellow muscle in a median raphe, with nerve supply from the pudendal nerve, and whose action assists the sphincter urethrae.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.