Histology Embryology General plan of digestive tract Except for oral cavity and pharynx, all other organs share a similar histological plan Submucosal Nerve plexus Gland in submucosa Meeney 1. Mucosa Duct from 2. Submucosa 3. Muscularis externa Mucosa submucosa Muscularis Serosa Circular Connective 4 Adventitia epithelium muscle tssue amana propn LongitudinallPeritoneum Muscularis muscle from lumen(inside)outGeneral plan of digestive tract ---Except for oral cavity and pharynx, all other organs share a similar histological plan 1. Mucosa 2. Submucosa 3. Muscularis externa 4. Adventitia from lumen (inside) out