Poal Acinus means

The hepatic or poal acinus is the functional unit of the liver.The acinus consists of an irregular shaped, roughly ellipsoidal mass of hepatocytes aligned around the hepatic aerioles and poal venules just as they anastomose into sinusoids.The acinus is roughly divided into zones that correspond to distance from the aerial blood supply - those hepatocytes closest to the aerioles (zone 1 below) are the best oxygenated, while those fahest from the aerioles have the poorest supply of oxygen. This arrangement also means that cells in the center of the acinus (again, zone 1) are the first to "see" and potentially absorb blood-borne toxins absorbed into the poal blood from the small intestine.Reference: Krishna Garg Histology; 5th edition; Page no: 171