primitive node

primitive node definition - medical

primitive node

noun
A knotlike thickening at the anterior end of the primitive streak of the blastoderm at the point of origin of the embryonic head. Also called Hensen's node, primitive knot.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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