Gill-rakers moderate in size; first branchial arch
with 9-12, usually 10 rakers in epibranchial, and 13-16, usually 14 rakers in ceratobranchial + hipobranchial.
Five new species of genus Astyanax Baird & Girard, 1854 from Rio Iguacu, Parana, Brazil (Ostariophysi, Characiformes, Characidae)/ Cinco novas especies do genero Astyanax Baird & Girard, 1854 do Rio Iguacu, Parana, Brasil (Ostariophysi, Characiformes, Characidae)
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