branchial groove

noun Embryology.
one of a series of rudimentary depressions on the surface of the embryo between adjacent branchial arches, homologous to the branchial clefts of gill-breathing ancestral forms.
Also called visceral groove. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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The external acoustic meatus is developed from the first branchial groove.
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