Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display Lumen of gastrointestinal tract Endocrine cells Mucous cells Epithelium Exocrine cells Lamina Mucosa Muscularis major blood and Submucosa lymphatic vessels Submucosal nerve plexus Muscularis muscle externa Myenteric Longitudinal Ducts from external exocrine Abdominal cavity glands(liver, pancreas 消化道与吸收有关的结构 The gut wall has a layered organization, with the absorptive cells lining the lumen and neural and muscular components below. blood and lymph vasculature is abundant to transport absorbed nutrients消化道与吸收有关的结构 The gut wall has a layered organization, with the absorptive cells lining the lumen and neural and muscular components below. Blood and lymph vasculature is abundant to transport absorbed nutrients