part of part of overlaps overlaps portal lobule hepatic acinus MA:0002496 UMLS:C0227519 FMA:14654 uberon liver acinus portal acinus UBERON:0001172 SCTID:272214009 NCIT:C32992 EMAPA:35497 The functional unit of the liver, consisting of a mass of hepatocytes from adjacent liver lobules aligned around the hepatic arterioles and portal venules just as they anastomose into sinusoids. liver parenchyma liver lobule acinus of exocrine gland