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head fold

head fold in Medicine

head fold n.
A ventral folding of the cephalic extremity in the embryonic disk, so that the brain lies in a rostral direction to the mouth and pericardium.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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