branchial groove


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branchial groove

n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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The embryology of these anomalies reveals that the lesions are derived from the dorsal portion of the first branchial groove and lie between the derivatives of Meckel's and Reichert's cartilages.
It becomes more superficial and rostral as it proceeds ventrally, and it ends adjacent to the deep surface of the epibranchial placode on the dorsal and caudal aspect of the first branchial groove. There are no branches, and the geniculate ganglion is not yet present (figure 5).