Zoology - Digestion and Absorption Question with Solution | TestHub

The wall of alimentary canal is made up of four basic layers. Ist of all there is serosa which is a thin membranous covering around oesophagus. Then there is muscle layer-outer layer of longitudinal muscles and inner layer of circular muscles. Last there is submucosa, which contains a few oesophageal glands. Then comes mucosa, which have several layers of flattened cells.