Duodenum – Small Intestine

by James Pickering, PhD

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    00:01 So let's have a look at the individual parts of the small intestine. We start off with the duodenum. We can see here the duodenum, as I have mentioned on the numerous occasions is "C" shaped. We have got the part of the stomach here where you have got the pyloric sphincter, so you have got the pylorus.

    00:16 And that's allowing food to pass through, once the pressure is built up in the stomach food can pass through the pyloric sphincter where it then enters into the duodenum. Within the duodenum you can see these circular folds. And we can recognize four parts to the duodenum. We can recognize four parts. We have got this superior portion here. So we have got this superior portion.

    00:43 And then we have got this descending part of the "C" that runs down in this direction.

    00:48 This descending part, we have got a horizontal part that sweeps back towards the left And then we have got an ascending part that runs up and then becomes the duodenojejunal flexure as it is continuous with the jejunum which then starts in the upper left quadrant and passes down to the lower right.

    01:08 So we can see we got some four parts of the duodenum and these are called the superior, the descending, horizontal, and the ascending.

    01:20 Also sitting in this concavity of the duodenum is the head of the pancreas. And we will see this again in more detail when we look at the pancreas in a later lecture.

    01:31 The head of the pancreas actually fills this concavity which is a good location as it enables the pancreatic juice to pass into the duodenum. We see that over in this side where we have a series of pancreatic ducts.

    01:47 Taking pancreatic juice from the pancreas and passing into the duodenum.

    01:52 We can also see when we'll come across this in more detail later on, we have this arrangement with the gallbladder that's storing bile. And we have series of hepatic ducts and bile ducts taking bile from the liver where it's produced, the gallbladder where it's stored and allowing that to pass into duodenum.

    02:11 And it passes into the duodenum via what's known as the duodenal papilla.

    02:16 you have a major one and you have a minor one.

    02:20 So here we can see the various anatomy of the duodenum.

    02:24 Its four parts we can see again on this diagram at the top.

    02:26 We have got superior part, descending part, horizontal part and an ascending part. Here we have got the stomach and we have got the jejunum.

    02:36 Within the duodenum we have got these circular folds that again help to increase the surface area.

    02:41 And about half way down this horizontal part, we have got the opening for the major duodenal papilla. Slightly superior to it, we've got opening for the minor duodenal papilla. And these allow the bile and the pancreatic juice to enter into the duodenum to carry out the process, to continue the process of digestion.

    About the Lecture

    The lecture Duodenum – Small Intestine by James Pickering, PhD is from the course Abdomen.

    Included Quiz Questions

    1. Descending
    2. Superior
    3. Horizontal
    4. Ascending
    5. Posterior
    1. Bile duct
    2. Accessory pancreatic duct
    3. Hepatic duct
    4. Cystic duct
    5. Cystic artery
    1. The head of the pancreas
    2. The tail of the pancreas
    3. The neck of the pancreas
    4. The gallbladder
    5. The spleen

    Author of lecture Duodenum – Small Intestine

     James Pickering, PhD

    James Pickering, PhD

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