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 ?
Among a high number of morphological and osteological characters, they also used the morphology of rakers and teeth, the number of gill rakers and teeth and the number of rows of the rakers on gill arches as well as the rows of teeth on tooth plates.
After formalin fixation and alcohol preservation, the specimens had their skin, muscles and connective tissue removed by a dissection procedure, exposing the scapulocoracoid cartilage and gill arches, a stereomicroscope was employed for this process.
Morphology of the pharyngeal cavity, especially the surface ultrastructure of gill arches and gill rakers in relation to the feeding ecology of the catfish Rita rita (Siluriformes, Bagridae).
2) In the primitive jawed vertebrate, the remaining gill arches (i.
The present investigation carried out basically with ecological indexes was aimed to study the monthly colonization of the various gill arches of Oreochromis niloticus (Linne, 1758) by four monopisthocotylea monogenean species.
We examined the gill arches for metacercariae and determined the number of infections per host-fish and developmental stage of parasites as previously described.
80-cm juvenile, the right and left gill arches (between the right and left ID and OD of each gill) presented both simple and apparently grouped cilia about 8--13[micro]m in length (Fig.
The enteropneust and cephalochordate pharynx share serially paired gill slits in the pharynx that are framed on either side by collagenous gill arches, and parted down the middle by a secondary gill (or tongue) bar.
The pharyngeal jaws together with the gill arches, tongue, and opening to the esophagus were dissected away from sacrificed specimens.