part_of part of part of has part has part has_part contributes to morphology of Homo sapiens portal lobule hepatic acinus hepatic artery portal triad https://upload.wikimedia.org/wikipedia/commons/6/62/Portal_triad.JPG 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. portal vein intrahepatic bile duct endoderm-derived structure multi organ part structure