Comparative Histological Study of the Oesophagus of Mammals

The mucosal layer of all four animals in the present study consisted of three layers. This layer probably lines all organs that communicate outside the body and may have protective and to some extent secretory in function. In this study the thickness of the mucosa increased gradually in goat and cow The muscularis extrema comprised of striated muscle fibres in the upper end and smooth muscle fibres in the lower end in human. In dog and cow skeletal muscle fibres were present throughout the length of the oesophagus. The serosal layer consisted of connective tissue fibres in all four mammals.