head fold


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Related to head fold: head process, neural fold

head fold

[′hed ‚fōld]
(embryology)
A ventral fold formed by rapid growth of the head of the embryo over the embryonic disk, resulting in the formation of the foregut accompanied by anteroposterior reversal of the anterior part of the embryonic disk.
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"Yeah, and a few acres of wetlands are gone here, and a few gone there, and no more birds." The bored high-school students, accustomed to the eye-boggling speed of MTV, are snapped out of their ennui by the sight of a great blue heron that "swooped effortlessly across the water, his white and black head folded back against his shoulders, his long orange/yellow legs trailing behind."