The mucosa or mucous membrane layer which is the innermost layer of the alimentary canal wall, adsorbs nutrients .
The wall of alimentary canal possesses four layers - serosa , muscularis , submucosa , and mucosa . Serosa is the outermost layer and is made up of thin mesothelium and connective tissue . Muscularis is formed by smooth muscles usually arranged into an inner circular and an outer longitudinal layer . Sub-mucosa layer is formed of loose connection tissues congaing nerves , blood and lymph vessels .
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