Cantlie's line represents one of the most significant anatomical landmarks in hepatobiliary surgery, serving as the principal plane for dividing the liver into functional left and right lobes. This surgical boundary has revolutionized our approach to hepatectomies and remains crucial for modern liver surgery, from traditional resections to advanced transplantation techniques.

The external iliac artery is a major pelvic artery that continues as the femoral artery. It supplies the lower limb and gives off inferior epigastric and deep circumflex iliac branches.