branchial arch

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branchial arch

n.

branchial arch

Embryology
See Pharyngeal arch.

Zoology
One of a number of bony or cartilaginous arches which support gills on either side of the throat of fishes and amphibians.

pha·ryn·ge·al arch

(făr-in'jē-ăl ahrch)
Typically, there are six arches in embryos of vertebrates; in the lower vertebrates, they bear gills; in the higher vertebrates (e.g., human embryos), they appear transiently and give rise to specialized structures in the head and neck.
Synonym(s): branchial arch.

branchial arch

Any of five pairs of arched structures that form the lateral and ventral walls of the pharynx of the embryo. The first is the mandibular arch; the second is the hyoid arch; the third, fourth, and fifth arches are transitory. They are partially separated from each other externally by the branchial clefts and internally by the pharyngeal pouches. They are important in the formation of structures of the face and neck.
Synonym: pharyngeal arch
See also: arch
References in periodicals archive ?
2) In the primitive jawed vertebrate, the remaining gill arches (i.
Their gill arches were slit and they were thrown into the next bin, where they twitched and gasped, slowly bleeding to death.
Mouth and gill cavities, gill arches, tongue, and both jaws black; gill rakers pale.