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Bell's muscle

n.
  1. A band of muscular fibers forming a slight fold in the wall of the bladder, running from the uvula vesicae to the opening of the ureter on either side, and bounding the trigonum.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.