part of part of contributes to morphology of small intestine ileum AAO:0010403 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] BTO:0000620 CALOHA:TS-0472 EFO:0001334 EMAPA:32764 EV:0100075 FMA:7208 GAID:315 MA:0000339 MAT:0000282 MESH:A03.492.411.620.484 MIAA:0000282 NCIT:C12387 OpenCyc:Mx4rvdcLHZwpEbGdrcN5Y29ycA TODO consider ZFA:0000706 posterior intestine, see also colon The ileum is the final section of the small intestine in most higher vertebrates, including mammals, reptiles, and birds. In fish, the divisions of the small intestine are not as clear and the terms posterior intestine or distal intestine may be used instead of ileum.[Wikipedia:Ileum] UBERON:0002116 UMLS:C0020885 VHOG:0000647 XAO:0000237 distal intestine galen:Ileum ileal intestinum ileum lower intestine posterior intestine the portion of the small intestine that extends from the jejunum to the colon uberon subdivision of digestive tract