anterior: the free border of the lesser omentum, known as the hepatoduodenal ligament. This has two layers and within these layers are the common bile duct, hepatic artery, and hepatic portal vein. posterior: the peritoneum covering the inferior vena cava superior: the peritoneum covering the caudate lobe of the liver inferior: the peritoneum covering the commencement of the duodenum and the hepatic artery, the latter passing forward below the foramen before ascending between the two layers of the lesser omentum. left lateral: gastrosplenic ligament and splenorenal ligament