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depressor muscle of septum

n.
  1. A vertical fasciculus from the orbicular muscle of the mouth passing upward along the median line of the upper lip and inserted into the cartilaginous septum of the nose.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.