The histological structure of digestive tube in Chondrostoma regium .

Abstract

The present study was carried out to determine the histological structure of digestive trube in Chondrostoma regium . The histological study showed that wall of the digestive tube is comprised of four layers these are: tunica mucosa, tunica sub mucosa, tunica muscularis and tunica serosa. The tunica mucosa of the esophagus is represented by lining epithelium of stratified epithelium tissue with mucous cells and supported by lamina propria/ sub mucosa, as the muscularis mucosa has not distinguished in the esophagus and along the intestine in this species. The lining epithelium of the intestine is represented by simple columnar epithelial tissue with mucous cells as well as the present study has demonstrated that the mucous cells of the esophagus gave negative expression for PAS-- and positive expression for AB+ whereas the mucous cells along the intestine gave positive expression for both PAS+ and AB+ .