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rhinal sulcus

n.
  1. The shallow sulcus that delimits the anterior part of the parahippocampal gyrus from the fusiform gyrus and marks the border between the neocortex and the areas medial to it.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.