branchial arch

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Related to Branchial arches: Branchial cyst, branchial fistula

branchial arch

[′braŋ·kē·əl ′ärch]
(vertebrate zoology)
One of the series of paired arches on the sides of the pharynx which support the gills in fishes and amphibians.
References in periodicals archive ?
As this is an anomaly of the first and second branchial arches, most alterations are associated with structures developed from these arches, (28) presenting wide phenotypic variation.
aureus continued even after surgical removal of the gill rakers and microbranchiospines, indicating that the surfaces of the branchial arches themselves are involved in the generation of inertial lift forces (Smith and Sanderson, 2007).
Within the branchial arches, five pairs of ceratobranchials (cb) lie ventrally to four paired epibranchials and the pharyngobranchials (not shown).
Disruption of the vascular supply to first and second branchial arches at about 30-40 days of gestation.
However, in general, the branchial apparatus structures develop between the 4th and 6th week of gestation and consist of 6 pairs of mesodermal branchial arches separated by 5 paired endodermal pharyngeal pouches internally and 5 paired ectodermal branchial clefts externally.
Other proposed theories are mesodermal dysplasia of Ist and IInd branchial arches.
At the fifth week of fetal development, the first and second branchial arches of the pharyngeal wall undergo a downward proliferation and meet the epicardial ridge, thereby closing the communication of the second, third, and fourth clefts with the exterior surface of the neck.
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.
According to the most recent hypothesis, it is caused by an impaired midline fusion of the first branchial arches.
The dlx homobox gene codes for regional specification of branchial arches and mutation in these genes is associated with the aberrant branchial arches.
Of the six branchial arches in humans, the fifth and sixth are rudimentary.