Comparative Morphological and Histochemical Study of Esophagus, in Eurasian Collared Dove (Streptoplia decaocto) and Buzzard (Beuteo beuteo vulpinus)

The study carried out on 28 esophagus specimens of healthy, 14 Eurasian Collared Dove (Streptoplia decaocto) and 14 Buzzard (Beuteo beuteo vulpinus). The aimed, to study the esophagus's morphological also histological. The lumen of esophagus in dove appear narrower and shorter in length than Buzzard as well as the crop as well-developed sac , while the crop in buzzard as longitudinal narrow spindle dilation ,and the present research work was done on the histology and histochemistry of the esophagus in dove and buzzard and found that the esophagus was composed of three segment cervical, crop and thoracic ,histologically, the mucosa of cervical, thoracic part was lined by non-keratinized layer of stratified squamous cells. As well as The esophageal glands were absent in cervical part and crop in dove, whereas in the thoracic part these glands were present and their duct open toward the lumen of the esophagus. The mucosal folds well developed in the cervical portion. Histochemically, the epithelium gland of esophagus showed PAS positive reaction that indicated presence of neutral mucopolysaccharides, the esophageal glands showed strong moderate reaction by (PAS)in cervical and thoracic esophagus as well as in thoracic part in dove. Conclusion the results showed that esophagus was significantly different Morphological and histological between two birds.