1 - Oropharynx, 2 - Laryngopharynx, 3 - Upper esophageal sphincter (UES), 4 - Esophagus, 5 - Lower esophageal sphincter (LES), 6 - Stomach, 7 - Pyloric sphincter, 8 - Duodenum, 9 - Jejunum, 10 - Ileum, 11 - Ileocecal sphincter , 12 - Cecum, 13 - Ascending colon, 14 - Transverse colon, 15 - Descending colon, 16 - Sigmoid colon, 17 - Rectum, 18 - Anus,

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