From the viewpoint of gross anatomy, the liver has four lobes: left anatomical right anatomical caudate quadrate This lobe division is based on surface features. The left lobe of liver is divided from the right as viewed from the top by the falciform ligament. The falciform ligament attaches the liver to the anterior body wall. The ligamentum venosum and ligamentum teres divide the left lobe of liver from the right as viewed from behind. The discipline of functional anatomy divides the liver into left and right lobes based on their relation to the common bile duct, hepatic portal vein, and hepatic artery proper. Each of these structures divide into left and right branches. The areas served by the left branch of these structures constitutes the left lobe of liver from the viewpoint of functional anatomy. They are referred to as the functional left lobe of liver. The functional left lobe of liver is also divided from the right by an imaginary plane that connects the inferior vena cava and the gallbladder fossa.