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frontal sulcus

n.
  1. A sagittal fissure on the outer surface of each frontal lobe of the cerebrum, demarcating the middle from the inferior frontal gyrus; inferior frontal sulcus.
  2. A sagittal fissure dividing the middle frontal gyrus into an upper and lower part; middle frontal sulcus.
  3. A sagittal fissure on the superior surface of each frontal lobe of the cerebrum, forming the lateral boundary of the superior frontal gyrus; superior frontal sulcus.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.