Histology of alimentary canal

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Digestion and absorption class 3

from esophagus to the rectum the wall of alimentary canal have 4 layers namely serosa, muscularis externa, sub mucosa and mucosa.
 

 Serosa: outermost layer. made by thin mesothelium
Muscularis Externa formed by smooth muscles. divided into outer longitudinal, inner cicular muscles.
Sub mucosa: formed by connective tissue.
mucosa: innermost layer. 

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