NCIt definition : A triangular-shaped unit of hepatic tissue, containing portions of three adjacent
hepatic lobules with the portal canal in the center. The portal canal is composed
of the portal vein, hepatic artery, bile ductile, and lymph vessel. There is a central
vein at the apex of each peripheral corner. Blood flows from the portal vein and hepatic
artery towards the central vein. Bile flows in the opposite direction, towards the
portal canal.;