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Lesser Sac and Lesser Omentum – Peritoneum

by James Pickering, PhD
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    00:01 Okay, let's explore the lesser sac in a little bit more detail.

    00:03 Here we can see the liver and we can see the stomach and we can see the membrane between the liver and the stomach: the lesser omentum.

    00:12 So here we can see the lesser omentum running here.

    00:18 Remember the lesser omentum, its free edge epiploic foramen allowing the greater sac and the lesser sac to communicate.

    00:30 If we were to look at the boundaries of the lesser sac then to do that we have opened up this lesser omentum here. And we can see posteriorly we have this organ which is the pancreas.

    00:41 Now if you are standing on the pancreas and you are looking forwards the anterior boundary is going to be the stomach in the lesser omentum, obviously.

    00:51 You have got the pancreas behind you You have got the stomach in front of you. So the anterior and posterior boundaries are those two.

    00:59 Laterally, so over in this direction we have got the spleen.

    01:02 In the lesser sac here now with the stomach being lifted up.

    01:07 So anteriorly it's being removed to see in the lesser sac. Posteriorly got the pancreas.

    01:12 Laterally, we have got the spleen over here and medially we have got the caudate lobe of the liver. And these are the boundaries of the lesser sac.

    01:20 Remember the lesser sac can communicate with the greater via the epiploic foramen.

    01:26 Let's concentrate on the lesser omentum.

    01:31 The lesser omentum this double layer of peritoneum extending from the lesser curvature of the stomach.

    01:35 to the liver. It also extends from this first bit of the first part of the duodenum. So we can see the lesser omentum extends the lesser curvature of the stomach.

    01:50 And the first bit, the first of the duodenum so it's extending here and its going to the liver, and that's the lesser omentum.

    01:58 Because it is coming from the stomach and the duodenum to the liver it's got two peritoneal ligaments within it.

    02:08 The lesser omentum can be divided into two peritoneal ligaments.

    02:11 The heptograstric ligament, liver stomach connection so this be here.

    02:18 This will be your hepatogastric ligament.

    02:21 And the remaining part that is going from the liver to the duodenum, so this portion here is the hepatoduodenal ligament.

    02:29 The hepatoduodenal ligament is really important. It contains what's known as the portal triad. It's three structures.

    02:38 Portal triad that pass towards and from the liver.

    02:44 It contains the hepatic portal vein taking venous blood from the GI tract to the liver.

    02:51 It contains the heptaic artery providing the liver with oxygen and nutrient rich blood for it to function. It also contains the bile duct which is bile produced in the liver; the way for it to pass into the duodenum.

    03:06 So it's three structures. Deep to it this is the hepatoduodenal ligament and then we can see the omental foramen again this little aperture just underneath.

    03:16 That communicate as I have said, the lesser and greater sacs.

    03:20 If you were to insert a finger in this foramen then you would have four boundaries.

    03:24 Your finger in this foramen, then posteriorly it find your inferior vena cava.

    03:32 Anteriorly, you would find your hepatoduodenal ligament and the portal triad.

    03:36 Superiorly you would have the caudate lobe of your liver and inferiorly you would have your duodenum, the first part of the duodenum.

    03:45 With your finger communicating between the greater and the lesser sacs they are the boundaries of the epiploic or the omental foramen.


    About the Lecture

    The lecture Lesser Sac and Lesser Omentum – Peritoneum by James Pickering, PhD is from the course Abdomen.


    Included Quiz Questions

    1. Spleen
    2. Stomach
    3. Liver
    1. Hepatic vein
    2. Hepatic artery
    3. Bile duct
    4. Hepatic portal vein
    1. Gastrocolic
    2. Gastrosplenic
    3. Gastrophrenic
    4. Gastroduodenal

    Author of lecture Lesser Sac and Lesser Omentum – Peritoneum

     James Pickering, PhD

    James Pickering, PhD


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