2. General plan of digestive tract Except for oral cavity and pharynx, all other organs share a similar histological plan Submucosa Nerve Gand in submucosa Duct from UCosa Submucosa Muscularis Serosa Mucous Connective epithelium muscle propra ongitudinal Peritoneum2. General plan of digestive tract ---Except for oral cavity and pharynx, all other organs share a similar histological plan