what is the histology of alimentary canal. briefly explain about the 4 layers. is outer longitudinal and inner circular muscle considered as muscularis externa?
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The wall of the alimentary canal has the same basic structure throughout its length. It consists of four basic layers. Listed from the lining epithelium to the covering tissue, they are 1) the mucosa, 2) submucosa, 3) muscularis externa, and 4) the serosa or adventita.
The muscularis externa surrounds the submucosa and is composed of two muscle layers, the inner circular layer and outer longitudinal layer. These two layers move perpendicularly to one another and form the basis of peristalsis. The adventitia consists of connective tissue containing blood vessels, nerves, and fat.
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from Allen module .....histology of alimentary canal
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