Embryonic Study Of Tracheo-Esophageal Region During Embryonic Development In Chick Embryo .(Gallus Deomesticus L. )

Abstract

The aim of this study was to investigate the separation of the trachea-esophageal region (TE) in the chick embryos (Gallus domesticus L.). TE development was followed between stage (14) to stage (19) of Hamburger and Hamilton (H&H). Many debates were found in recent researches as attempts to fill the gaps to complete knowledge about the mechanisms involved during the earlier stages of trachea-esophageal formation.The present deals with the histogenesis of TE region in chick embryos. The histological study revealed different developmental morphology of the pharyngeal lumen in the serial transverse sections. The histological results also demonstrated lateral compression of the wide lumen of the pharynx that is probably produced by the massive bilateral sclerotomal development accompanied by deviation of the anterior cardinal veins and the fusion of dorsal aorta