The present work was conducted to study the histoarchitectural and morphometrical characteristics of the oesophagus in six adults, apparently healthy Large White Yorkshire cross-bred pigs (SVVU-T-17 Breed). The lamina epithelialis consisted of keratinized stratified squamous epithelium. Lamina propria consisted of areolar connective tissue, lymphatic aggregates and ducts of the glands. The lamina muscularis mucosae consisted of a few, small, scattered bundles of smooth muscles in the pharyngoesophageal region, cranial cervical, middle cervical and caudal cervical regions and it formed a continuous layer in the cranial thoracic regions to cardia regions of the oesophagus. The thickness of lamina muscularis gradually increased from the cranial thoracic to the cardia region of the oesophagus. The submucosal glands were compound tubuloalveolar, mixed in nature and they were more extensive at the pharyngoesophageal junction and began to fade out at about the caudal cervical region of the oesophagus. The submucosa layer of the cranial thoracic region consisted of one or two small glands and that of the middle thoracic, caudal thoracic and cardia regions lack submucosal glands. The highest thickness of total tunica muscularis was measured in the cranial thoracic part of the oesophagus and the lowest thickness was measured in the middle cervical part of the oesophagus in pigs. Tunica muscularis was composed of skeletal muscle fibres in the cranial two-thirds of the pig oesophagus but the caudal third amalgamation of both skeletal and smooth fibres. The tunica adventitia consisted of loose connective tissue with abundant reticular fibres, collagen fibres, few elastic fibres, many blood vessels, adipose tissue, lymph vessels and nerves. 

Highlights

• In-detail study of histology of various regions of the oesophagus in pig.
• Histomorphometry of various layers of the wall of the oesophagus at various regions in pig.