branchial arch

branchial arch

noun
1.
Zoology. one of a series of bony or cartilaginous arches on each side of the pharynx that support the gills of fishes and aquatic amphibians; gill bar.
2.
Embryology. one of a series of archlike mesodermal thickenings of the body wall in the pharyngeal region of the embryo of amphibians, reptiles, birds, and mammals.
Also called gill arch, visceral arch.


Origin:
1870–75

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

branchial arch n.
Any of usually six embryonic arches that give rise to specialized structures in the head and neck in the higher vertebrates. Also called gill arch, pharyngeal arch, visceral arch.

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

branchial arch

one of the bony or cartilaginous curved bars on either side of the pharynx (throat) that support the gills of fishes and amphibians; also, a corresponding rudimentary ridge in the embryo of higher vertebrates, which in some species may form real but transitory gill slits. In the human embryo, the branchial arches give rise to such structures as the mandible, hyoid bone, and larynx.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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