Specific Considerations with Liver Disease - Hepatic Anatomy
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- The anatomic unit of the liver is lobule. The lobule is composed of hexagonal plates of hepatocytes and portal triads (terminal portal vein, hepatic artery, and bile duct branch) surrounding a central hepatic vein.
- Hepatocytes are classified by their position in relation to their portal triad. Those closest to the triad are labeled Zone 1 cells (periportal). These cells receive the most oxygen and nutrients and are responsible for most nitrogen metabolism, oxidation, and gluconeogenesis. Zone 2 is a transitional area. Zone 3 hepatocytes (pericentral) are the farthest from the triad and are at the greatest risk for ischemic injury.