NEET PG DENTAL EXAM

Detailed explanation-1: -Each arch is separated from the next on the embryo’s external surface by pharyngeal grooves (clefts), and on the internal surface by depressions called pharyngeal pouches. Pharyngeal pouches are developed from the endoderm and they open towards the pharyngeal clefts.

Detailed explanation-2: -Branchial arches, or gill arches, are a series of bony “loops” present in fish, which support the gills. As gills are the primitive condition of vertebrates, all vertebrate embryos develop pharyngeal arches, though the eventual fate of these arches varies between taxa.

Detailed explanation-3: -The resulting pouches give rise to the middle ear cavity, Eustachian tube, mastoid air cells, palatine tonsils, thymus, parathyroid, and parafollicular cells of the thyroid. [7] Each of these tissues develops from their respective pharyngeal pouch, or pouches, in the case of the parathyroid gland.