"Sir James Cantlie (1851–1926) was a Scottish surgeon who published his observations about an anatomical midline for the liver in 1897 which for the first time recognised that the liver could be bisected into functionally left and right halves 2."
"Segments 2, 3, 4a, and 4b are to the left of the plane and segments 5, 6, 7 and 8 lie to the right."