Hepatic lobule is called the functional unit of the liver. Hepatic lobules can generally be categorized in three types: classical, portal and acinus. Lobule consists of hexagonal structure. Hexagon consists of a central vein in the middle and six triads in the corners. Triad - bile duct + hepatic artery + portal vein. Kupffer cells - phagocytes present between hepatocytes and sinusoids. Hepatocytes - liver cells. These cells radiate out from central vein in the liver. Solution Hepatic lobule is called the functional unit of the liver. Hepatic lobules can generally be categorized in three types: classical, portal and acinus. Lobule consists of hexagonal structure. Hexagon consists of a central vein in the middle and six triads in the corners. Triad - bile duct + hepatic artery + portal vein. Kupffer cells - phagocytes present between hepatocytes and sinusoids. Hepatocytes - liver cells. These cells radiate out from central vein in the liver..