TOPICS: Mucosa, submucosa, muscularis propria, deepest layer, muscularis mucosae, Brunner’s glands, lamina propria, Peyer’s patches, submucosal plexus, myenteric (Auerbach’s) plexus, serosa, adventitia, lymphoid nodule, lacteal, lymphatic capillary, intussusception, achalasia, Hirschsprung’s disease, i peristalsis, visceral peritoneum, taenia coli, ulcers, erosions, iron deficiency anemia, small bowel obstruction (SBO), longitudinal muscle layer, circular muscle layer, mucous epithelium, intramural plexus, peritoneum, outer longitudinal muscle layer, inner circular muscle layer, lower esophageal sphincter (LES), Hirschprung’s disease, intraperitoneal structures, stomach