How many segments is the liver divided into according to Couinaud’s system?

Couinaud's system divides the liver into eight functionally independent segments. This segmentation is based on the distribution of the hepatic veins and the portal triads, which allows for a clear understanding of liver anatomy in relation to surgical procedures and liver diseases. Each segment operates independently in terms of blood supply and biliary drainage, leading to the clinical importance of this classification. The eight segments are numbered I through VIII, where segment I is the caudate lobe and the remaining segments are categorized based on their position around the hepatic veins. This system is particularly essential for liver resections and transplant surgeries, as it provides a precise anatomical framework for clinicians.