part of part of has part has part contributes to morphology of portal lobule hepatic acinus hepatic artery portal triad A multi-organ-part structure that consists of three vessels of the portal lobule including the bile duct, a terminal branch of the hepatic artery and portal vein, and may also include a lymphatic vessel FMA:17523 MA:0002499 The misnomer 'portal triad' traditionally has included only the first three structures, and was named before lymphatic vessels were discovered in the structure. It can refer both to the largest branch of each of these vessels running inside the hepatoduodenal ligament, and to the smaller branches of these vessels inside the liver. UBERON:0001279 UMLS:C0227514 trias hepatica trias hepatica uberon portal vein intrahepatic bile duct endoderm-derived structure multi organ part structure