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Wall alimentary canal four layers Illustration and Icon
Wall alimentary canal four layers
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A cutaway histologic diagram of the gastrointestinal (GI) tract wall shows the canonical four layers. From lumen outward: mucosa with epithelium, lamina propria, and muscularis mucosae; submucosa containing vessels and the submucosal plexus (Meissner’s plexus) of the enteric nervous system (ENS); muscularis externa with inner circular and outer longitudinal smooth muscle separated by the myenteric plexus (Auerbach’s plexus); and an external serosa/adventitia. In anatomical histology and physiology, this layered organ wall enables secretion, absorption, and coordinated peristalsis in the digestive system.
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