Histological study of oesophagus in white breasted kingfisher (Halcyonsmyrnensis)

Abstract

The present study aims to study the histological structure of oesophagus in white breasted kingfisher (Halcyonsmyrnensis). The result showed that the oesophagus wall consisted of only three tunica represented by mucosa, muscularis and adventitia or serosa, the tunica sub mucosa was absent. The tunica mucosa composed of two layers represented by lining epithelium and lamina propria because the muscularis mucosae were absent. The lining epithelium consisted of non keratinized stratified squamous epithelium, the lamina propria composed of fibrous connective tissue. The oesophageal glands were simple tubular type and arranged along the oesophagus. Tunica muscularis consisted of two layers inner thin longitudinal and outer thicker circular, these layers separated by fibrous connective tissue. The oesophagus surrounded by the tunica adventitia at anterior part (Cervical), and by the tunica serosa at the posterior part (Thoracic).