part_of part of part of artery endothelium of artery An endothelium that is part of an artery [Automatically generated definition]. BTO:0004757 AAO:0011013 UBERON:0001917 VHOG:0001215 XAO:0000357 arterial endothelium UMLS:C1179025 FMA:62116 uberon EMAPA:35148 MA:0000707 NCIT:C49194 artery endothelium Vertebrates and a very few invertebrates such as squids have evolved a secondary epithelium, the endothelium, that lines their blood vessels.[well established][VHOG] The endothelium is the thin layer of cells that lines the interior surface of blood vessels, forming an interface between circulating blood in the lumen and the rest of the vessel wall.[AAO] endothelium endothelial tube blood vessel endothelium arterial system endothelium