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The liver is the largest gland of the body. It normally weighs about 1.5kg. The sharp inferior border of the liver does not normally extend below the right costal margin. If it does, it is enlarged. In order to free the liver for study, you must cut the falciform ligament, superior and inferior parts of the coronary ligament, the right and left triangular ligaments, the lesser omentum and the structures in its free margin (common bile duct, proper hepatic artery and portal vein) and the hepatic veins at the point where they empty into the inferior vena cava.
This is an anterior view of the liver. You should identify the:
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This an image of the visceral surface of the liver. Make sure you can orient yourself properly. Check out to see where the fundus of the gall bladder is located. Identify the following structures:
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Finally we take a look at the superior aspect of the liver. This part of the liver is separated from the heart by the domes of the diaphragm. In this image, the anterior (diaphragmatic) surface of the liver is upward and the visceral surface is downward on the page. This aspect allows you to identify the:
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Separation of the four lobes of the liver:
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Relationship of the visceral aspect of the liver to other abdominal viscera. |
Biliary System
The biliary system is made up of the ducts arising in the liver, the gall bladder and its duct and the common bile duct. Starting in the liver, the small biliary ducts converge to form the larger right and left hepatic ducts. These, in turn, join to form the common hepatic duct which joins with the cystic duct to form the common bile duct. Remember, when we studied the duodenum, that the common bile duct joins the major pancreatic duct to empty into the ampulla which then empties into the second part (descending part) of the duodenum. The gall bladder receives bile from the liver by way of the common hepatic duct into the cystic duct. The gall bladder stores and concentrates its contents and also excretes its bile back through the cystic duct to join the common hepatic duct to become the common bile duct which then carries the bile into the duodenum. The location of the tip of the fundus can be approximated on the surface of the abdomen at the point where the lateral edge of the rectus abdominis crosses the cartilage of the 9th rib. |
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