Gallbladder: Biliary Tree – Liver and Gallbladder

by James Pickering, PhD

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    00:00 So now let’s move on to the gallbladder and the biliary tree.

    00:04 So this diagram we have seen many times before now. As the liver lifted and we've exposed the stomach and the lesser omentum. And we can see that the liver on its visceral, its more posterior surface has the gallbladder attached to it.

    00:18 We can see the gallbladder here, this little sack.

    00:23 The gallbladder has a fundus right at the very tip which is poking out from the under surface of the liver.

    00:29 It has a body and it also has a neck.

    00:34 And that neck gives rise to the cystic duct.

    00:38 Again we can see we have a fundus down here in this isolated diagram showing component parts of the gallbladder. We have a fundus here, we have a larger body and then it take us down into this neck. The neck is in continuous with the cystic duct. We can see the cystic duct here and what's happening is the hepatocytes within the liver are producing bile.

    01:03 Now this bile needs to be stored and it's concentrated. And it does that within the gallbladder.

    01:09 So what here we have the liver and we have our left and our right hepatic ducts. These converge into a common hepatic duct, which unites with the cystic duct. And this allows a pathway for bile that's been produced in the liver to be stored in the gallbladder.

    01:27 So bile is then transferred from the liver to the gallbladder.

    01:31 Now it usually does this by passing all the way down to the duodenum first.

    01:38 So here we have got the bile duct. The bile duct formed by the union of the cystic duct here and the common hepatic duct.

    01:48 Where these two unite we find the bile duct.

    01:51 So what's happening. Bile is produced in the liver.

    01:57 Bile then runs all the way down through the bile duct towards the duodenum.

    02:04 If the sphincter that's guarding this major duodenal papilla is closed Then the liver will continue to produce the bile but instead of being released back into the duodenum, it's going to pass all the way back up and go into the gallbladder.

    02:28 So as bile is passing down in this direction so if it's closed, the entrance to the duodenum is closed, then it will pass back up and be stored in the gallbladder.

    02:41 This means when in the gallbladder it will be concentrated and then when need to be outflow of bile can then enter into the duodenum say one once you eat a particularly fatty meal. And this relationship forms part of the biliary tree When we will look at the pancreas we will consider the inputs from the pancreas via the pancreatic duct.

    03:02 So, bile is stored and concentrated in the gallbladder. And this is if it becomes overly concentrated, overly dehydrated can lead to gall stones.

    About the Lecture

    The lecture Gallbladder: Biliary Tree – Liver and Gallbladder by James Pickering, PhD is from the course Abdomen.

    Included Quiz Questions

    1. Cystic duct and common hepatic duct
    2. Cystic duct and right hepatic duct
    3. Cystic duct and left hepatic duct
    4. Right and left hepatic ducts
    5. Common hepatic duct and right hepatic duct
    1. After consuming food rich in fat content
    2. During sleep
    3. During exercise
    4. After consuming food rich in protein content
    5. After consuming food rich in carbohydrate content
    1. Concentration and storage of bile
    2. Production of bile
    3. Removal of bile
    4. Dilution and breakdown of bile
    5. Digestion of fats

    Author of lecture Gallbladder: Biliary Tree – Liver and Gallbladder

     James Pickering, PhD

    James Pickering, PhD

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