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Formation Variation of the Hepatic Portal Vein – Portal System

by James Pickering, PhD
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    00:00 if you remember this occurs posterior to the neck of the pancreas. We can see a number of ways in which this can occur in this general schematic here and all the time we have the hepatic portal vein, so we have the hepatic portal vein here, we have the hepatic portal vein here and we have the hepatic portal vein in these two examples as well and what I am doing is I am just trying to illustrate the variation that we have. So we can see this one here, this one here, this one and this one, this is our left gastric vein. Now, the left gastric vein can take any one of these courses, the left gastric can drain directly into the hepatic portal vein here, or the left gastric vein can drain in the splenic vein which we have here. So we can see we have some possibilities for the left gastric vein draining into the hepatic portal vein. Similar happens here or we can drain directly into the splenic which we have here. We can see that the inferior mesenteric vein, here we got the splenic again; the inferior mesenteric vein can drain directly into the splenic, so here we can have the inferior mesenteric vein taking hindgut blood directly into the splenic vein and then as it unites with the superior mesenteric vein we have the formation of the hepatic portal vein. This one down here is very similar; it is just showing the alteration with the left gastric in place here.

    01:37 On this side we can see that the inferior mesenteric vein can actually drain into the superior mesenteric vein here instead, so it can drain instead of into the splenic it can pass into the superior mesenteric vein and then this will form the hepatic portal vein with the splenic. So we can see that we have multiple combinations where the left gastric drains into the hepatic portal or into the splenic or where the inferior mesenteric drains into the splenic or into the superior mesenteric. There are multiple combinations which we can have. I don’t think that it is necessarily important to be rigid of which one or to be confused about them, just appreciate that there is considerable variation.


    About the Lecture

    The lecture Formation Variation of the Hepatic Portal Vein – Portal System by James Pickering, PhD is from the course Abdomen.


    Included Quiz Questions

    1. Posterior to the neck of pancreas.
    2. Anterior to the neck of pancreas.
    3. Anterior to the tail of pancreas.
    4. Posterior to the head of pancreas.
    5. Anterior to the head of pancreas.

    Author of lecture Formation Variation of the Hepatic Portal Vein – Portal System

     James Pickering, PhD

    James Pickering, PhD


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