Mandibular arch

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Related to First branchial arch: mandibular arch, Second branchial arch
(Anat.) the most anterior visceral arch, - that in which the mandible is developed.

See also: Mandibular

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Developmental anomalies of structures derived from the upper half of the first branchial arch are common, giving rise to deformities such as cleft lip or cleft palate.
INTRODUCTION: Crouzon's syndrome is a developmental anomaly of first branchial arch.
Msx appears to be critical for the differentiation of first branchial arch ectoderm-mesenchyme leading to various craniofacial structures (14).
Postulated factors include disturbance of the interactions of growth factors,2 teratogenic drugs like meclizine,7 trauma late in pregnancy and local ischaemia and amniotic bands causing pressure on the first branchial arch.
The anterior two thirds originate from paired lateral lingual swellings, which are contributed by first branchial arch.
The defect is basically related to maldevelopment of first branchial arch.
Gillrakers on first branchial arch 5-9+27-31, total 33-40 (modally 8+29, total 36).
Cusps of non-symphysial teeth in premaxillary internal series in straight line or in slightly concave arch in ventral view; usually more than 2 maxillary teeth; external premaxillary series with 4 to 6 teeth, penta to heptacuspidate; premaxillary internal series with 5 teeth; first branchial arch usually 21 (9 + 13) to 29 (12 + 16) gill-rakers; a brown narrow and vertically elongate humeral blotch
Summary of soft anal rays, pectoral rays, and total gill rakers on the first branchial arch for three species of Amphiprion.
First branchial arch anomalies can extend deeply into the neck.
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 not reaching anus in male, dorsal-fin origin on vertical between base of last 3rd and 4th anal-fin rays, dorsal-fin rays 7-8, anal-fin rays 12-14, frontal squamation E-patterned, frontal scales arranged circularly, canal preopercular short and opened, contact organs absent, longitudinal series of scales 37-40, gill rakers of first branchial arch 1-2 + 8, red stripes on flank, jaws not distinctively pigmented, and round black spot on dorsal portion of caudal fin in female.
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.