Histological study of oesophagus in white breasted kingfisher (Halcyonsmyrnensis )

Abstract

AbstractThe present study aims to study the histological structure of oesophagus in whitebreasted kingfisher (Halcyonsmyrnensis ). The result showed that the oesophagus wallconsisted of only three tunica represented by mucosa, muscularis and adventitia orserosa, the tunica sub mucosa was absent. The tunica mucosa composed of two layersrepresented by lining epithelium and lamina propria because the muscularis mucosaewere absent. The lining epithelium consisted of non keratinized stratified squamousepithelium, the lamina propria composed of fibrous connective tissue. The oesophagealglands were simple tubular type and arranged along the oesophagus. Tunica muscularisconsisted of two layers inner thin longitudinal and outer thicker circular, these layersseparated by fibrous connective tissue. The oesophagus surrounded by the tunicaadventitia at anterior part (Cervical), and by the tunica serosa at the posterior part(Thoracic).