part of large intestine intestine colon Although all vertebrates have a digestive tract and accessory glands, various parts of this system are not necessarily homologous, analogous, or even present in all species. Therefore, broad comparisons can be best made under the listings of headgut, foregut, midgut, pancreas and biliary system, hindgut.[uncertain][VHOG] EFO:0000361 Last portion of the large intestine before it becomes the rectum. NCIT:C12382 UMLS:C0009368