There are many ways to divide the liver into segments and lobes, and the most internationally recognized classification rule is to divide the liver into five lobes and eight segments. The five lobes are the left outer lobe, left inner lobe, right anterior lobe, right posterior lobe and caudate lobe. The eight segments are based on the vascular distribution of the hepatic cleft, portal vein and hepatic vein, thus providing a functional segmentation of the liver. The caudate lobe is segment I, the left outer lobe is segments II and III, the left inner lobe is segment IV (segment IV is subdivided into segments IVa and IVb), the right anterior lobe is segments V and VIII, and the right posterior lobe is segments VI and VII. Each of the eight segments has its own inflow and outflow vessels and biliary system, so each segment is an independent unit and removal of any segment does not affect the others. For more information, it is recommended to consult a medical professional.