Arterial Supply Components of a Liver Lobule

Description

Radiating hepatic plates of hepatocytes form wedge-like cords around a centrally placed central vein (vena centralis), while at the lobular periphery small-caliber hepatic arterioles enter alongside branches of the portal vein to form the portal triads. From these peripheral arterial supply components, blood passes into the hepatic sinusoids and courses centripetally toward the central vein, running between hepatocyte plates in close apposition to Kupffer cell lined sinusoidal walls. Green ductules at the periphery represent bile duct branches that collect bile in the opposite direction, moving centrifugally away from the lobular center toward the portal tracts. Opposing flow is the point. Arterial inflow at the portal tract matters because it sets the oxygen gradient that defines the classic acinar zones, with zone 1 (periportal) receiving the highest oxygen tension and zone 3 (centrilobular, near the central vein) being most susceptible to ischemic injury and many toxic insults. That physiology maps cleanly onto pathology: centrilobular necrosis after shock, and acetaminophen related injury that preferentially affects zone 3 hepatocytes. The arterial component also underpins clinical angiography and transarterial therapies, since hepatocellular carcinoma often recruits a dominant hepatic arterial supply compared with surrounding parenchyma. Use this illustration in histology and GI anatomy teaching to pair microanatomy with flow direction, or in hepatopathology materials when explaining zonation patterns in congestion, hypoxia, and drug injury. It also fits hepatobiliary surgery and interventional radiology content where portal triads, dual blood supply, and biliary drainage need a clean schematic reference. Anatomical accuracy verified by SciePro's Medical Advisory Board.