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 ?
Distinguished from all other congeners by the combination of the following features: anterior portion of trunk slightly deeper than wide, jaws short, snout blunt, tip of anal fin rounded in male, caudal fin rounded in male, pelvic-fin tip reaching the anterior portion of the anal-fin base in male, dorsal-fin origin on vertical between base of 9th and 10th anal-fin rays, dorsal-fin rays 7-8, anal-fin rays 11-13, frontal squamation E-patterned, frontal scales arranged circularly, canal preopercular short and opened, contact organs on flank scales in male, longitudinal series of scales 29-32, gill rakers of first branchial arch 1 + 7, longitudinal rows of reddish brown dots stripes on flank in male, jaws black, and round black spot on dorsal portion of caudal-fin in female.
Our case illustrates the known developmental migration of second branchial arch anomalies while demonstrating an unusual finding of a complete branchial fistula presenting as an intraoral tonsillar cyst.
Amongst these, anomalies of second branchial arch as well as pouch are common.
9) Our patient satisfied three major criteria: coexisting first and second branchial arch anomalies and deafness.
INTRODUCTION: Crouzon's syndrome is a developmental anomaly of first branchial arch.
4-6) After fusion of the maxillary and mandibular processes, which are both derived from the first branchial arch, the parotid duct takes its normal position inside the mouth at the level of the superior second molar.
6-8,21 Exophytic masses within the oropharynx that are of branchial arch origin are very rare, with few cases reported in the literature.
The body of the arytenoid cartilage develops from branchial arch mesoderm and is made up of hyaline cartilage, and the vocal process originates in pharyngeal floor mesoderm and is made up of elastic cartilage.
In view of the boy's age and the location of the cyst, we made a provisional diagnosis of a branchial arch remnant, most likely from the second arch.
1) They are derived from different embryologic cell anlages: the epibranchial placode of the second branchial arch and the neural crest of the facial primordium, respectively.
It results from failure of fusion of mandibular and maxillary processes of the first branchial arch (1) and so Tessier cleft 7 is also associated with anomalies of the structures arising from first and second branchial arches.