anal canal anal columns anal sinuses anal valves ancient greece angular incisure anus ascending colon bird blind cardia cardiac glands carnivore cellulose circular folds colonoscopy descending colon dissection duodenojejunal flexure duodenum embryology enzyme epiploic appendix esophagus fundic glands gastric pits gastrointestinal tract greater curvature of the stomach greek philosophy gut-associated lymphoid tissue haustra hepatic flexure houston valve human anatomy ileocecal valve ileum intestinal villus intestine jejunum large intestine latin lesser curvature of the stomach lymph major duodenal papilla mammal medical subject headings medical university of vienna midgut minor duodenal papilla nasopharynx oropharynx pectinate line pharynx pyloric antrum pyloric canal pyloric glands pylorus rectal ampulla rectum reptile rugae suny downstate medical center sigmoid colon small intestine sphincter ani externus muscle sphincter ani internus muscle splenic flexure stomach suspensory muscle of the duodenum taenia coli torso transverse colon upper esophageal sphincter vermiform appendix