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pectinate muscle in Medicine

pectinate muscle

n.
  1. Any of the prominent ridges of atrial myocardium located on the inner surfaces of much of the right atrium and of both auricles.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.