enteric muscular system in gut wall of the small intestine outline diagram

enteric muscular system structure layers anatomy gut wall small intestine bowel laminar mesentery lumen plexuses circular longitudinal submucosa lamina propria epithelium muscularis mucosae muscle areolar connective tissue outline diagram scheme vector illustration concept explanation gastrointestinal tract cord labeled educational serosa lymphatic duct gland externa submucosal plexus ens digestive brain