Portal system

by James Pickering, PhD

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    This lecture is going to look at the portal venous system. The portal venous system is really important and there is a few of them throughout the body, but the portal system in general is where a capillary bed runs into another capillary bed before it returns to the systemic circulation and passes through the heart. So, for example we are used to blood passing via the arteries to a capillary bed, say a muscle and then into the venules and the veins which take it back to the heart, it can then be sent to the lungs for gases exchange to occur and then return and be distributed again. But this portal system allows blood that’s passed through a capillary bed to then pass to another capillary bed before returning to the heart and the portal venous system is a real good example of this. Venous drainage from the GI tract and the accessory organs travels to the liver, the second capillary bed via the hepatic portal vein and then via hepatic veins does it then drain into the systemic system and towards the heart. We also have some anastomoses between the portal system and the systemic system and this occurs normally during pathological situations which means blood can’t pass through the liver and it is actually directed via small blood vessels in the systemic circulation. So the portal venous system receives poorly oxygenated blood, it is nutrient rich blood because it is passed through the GI tract but the oxygen has been used up by those tissues to actually absorb the nutrients and blood from the gastrointestinal tract within the abdomen and pancreas and gall bladder and spleen passes to the liver. It is carried to the capillary beds of the liver and then subsequently it is returned...

    About the Lecture

    The lecture Portal system by James Pickering, PhD is from the course Abdominal and Pelvic Anatomy. It contains the following chapters:

    • Venous drainage
    • Formation variation of the hepatic portal vein
    • Portal-systemic anastomoses
    • Oesophageal, gastric and rectal veins
    • Paraumbilical and colic veins

    Quiz for lecture

    Test your knowledge with our quiz for lecture Portal system.

    1. Posterior
    2. Anterior
    3. Superior
    4. Inferior
    1. Inferior mesenteric
    2. Superior mesenteric
    3. Splenic
    4. Sigmoidal
    1. Azygous
    2. Inferior rectal
    3. Superficial epigastric
    4. Retroperitoneal

    Author of lecture Portal system

     James Pickering, PhD

    James Pickering, PhD

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