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posterolateral groove

n.
  1. A longitudinal furrow located on either side of the posterior median sulcus of the spinal cord and medulla oblongata and marking the line of entrance of the posterior nerve roots.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.