Gross Anatomy: Overview of GI Histology
Overview 4 continuous walls of the GI tract from inner to outer: • Mucosa and submucosa, which, in the upper sections, is thrown into folds surrounding the lumen • The muscularis (externa), which comprises an inner circular layer and outer longitudinal layer • The adventitia (if the organ is directly adhered to the body wall) or serosa (if the organ is suspended by mesenteries). Enteric Innervation: • The plexus of Meissner (aka, submucosal plexus) • The plexus of Auerbach (aka, myenteric plexus
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