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rectococcygeal muscle

(rĕk′tō-kŏk-sĭjē-əl)
n.
  1. A band of smooth muscle fibers passing from the posterior surface of the rectum to the anterior surface of the second or third coccygeal segment.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.