vein mesenteric vein In humans the inferior mesenteric vein empties into the splenic vein, the superior mesenteric vein joins the splenic vein to form the portal vein RETIRED_EHDAA2:0001125 EMAPA:17348 SCTID:304045008 BTO:0002781 Wikipedia:Mesenteric_vein EHDAA:4442 NCIT:C53055 MA:0002177 UBERON:0005617 UMLS:C0025473 intestinal vein MESH:D008642 A vein that returns blood from the intestines. uberon