Although the liver is a fairly solid organ, it is plastic, and moulds itself to even hollow neighbouring viscera rather than they to it. The superior surface is in contact with the diaphragm, but has peritoneum between (see COELOM AND SEROUS MEMBRANES). At its posterior margin the peritoneum of the great sac is reflected on to the diaphragm to form the anterior layer of the _coronary ligament_. Near the mid line of the body, and at right angles to the last, another reflection, the _falciform ligament_, runs forward, and the line of attachment of this indicates the junction of the _right_ and _left lobes_ of the liver. The anterior surface is in contact with the diaphragm and the anterior abdominal wall. The attachment of the falciform ligament is continued down it. The posterior surface is more complicated (see fig. 1); starting from the right and working toward the left, a large triangular area, uncovered by peritoneum and in direct contact with the diaphragm, is seen. This is bounded on the left by the inferior vena cava, which is sunk into a deep groove in the liver, and into the upper part of this the _hepatic veins_ open. Just to the right of this and at the lower part of the bare area is a triangular depression for the right suprarenal body. To the left of the vena cava is the _Spigelian lobe_, which lies in front of the bodies of the tenth and eleventh thoracic vertebrae, the lesser sac of peritoneum, diaphragm and thoracic aorta intervening. To the left of this is the fissure for the _ductus venosus_, and to the left of this again, the left lobe, in which a broad shallow groove for the oesophagus may usually be seen. Sometimes the left lobe stretches as far as the left abdominal wall, but more often it ends below the apex of the heart, which is 3½ in. to the left of the mid line of the body. The relations of the lower surface can only be understood if it is realized that it looks backward and to the left as well as downward (see fig. 1). Again starting from the right side, two impressions are seen; the anterior one is for the hepatic flexure of the colon, and the posterior for the upper part of the right kidney. To the left of the colic impression is a smaller one for the second part of the duodenum. Next comes the _gall bladder_, a pear-shaped bag, the fundus of which is in front and below, the neck behind and above. From the neck passes the _cystic duct_, which is often twisted into the form of an S. To the left of the gall bladder is the _quadrate lobe_, which is in contact with the pylorus of the stomach. To the left of this is the _left lobe_ of the liver, separated from the quadrate lobe by the umbilical fissure in which lies the _round ligament_ of the liver, the remains of the umbilical vein of the foetus. Sometimes this fissure is partly turned into a tunnel by a bridge of liver substance known as the _pons hepatis_. The under surface of the left lobe is concave for the