rectum AAO:0010401 BTO:0001158 CALOHA:TS-1180 EFO:0000848 EHDAA2:0001592 EHDAA:5836 EMAPA:17896 EV:0100081 FMA:14544 GAID:311 In the lungfish, sharks and rays the rectum opens into the cloaca which also receives wastes (urine) from the kidneys and material from the reproductive organs. In bony fish the rectum reaches the outside environment through the anus, which is normally situated just in front the urinary and reproductive openings. However in some fish the digestive tract may be curled back on itself, and in the Electric Eel (Electrophorus electricus) the anus is situated in the fish's throat. -- http://www.earthlife.net/fish/digestion.html MA:0000336 MAT:0000050 MESH:A03.492.411.495.767 MIAA:0000050 OpenCyc:Mx4rvVjaU5wpEbGdrcN5Y29ycA The terminal portion of the large intestine between the ileo-pelvic colon and the anus. [Dorian_AF, Elsevier's_encyclopaedic_dictionary_of_medicine, Part_B:_Anatomy_(1988)_Amsterdam_etc.:_Elsevier][VHOG] UBERON:0001052 UMLS:C0034896 VHOG:0001751 XAO:0000238 galen:Rectum intestinum rectum rectal rectal sac terminal portion of intestine terminal portion of large intestine the terminal portion of the intestinal tube, terminating with the anus uberon subdivision of digestive tract