Portal venous system
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At the time the article was created Jeremy Jones had no recorded disclosures.
View Jeremy Jones's current disclosuresAt the time the article was last revised Amir Mahmud had no financial relationships to ineligible companies to disclose.
View Amir Mahmud's current disclosures- Portal systems (disambiguation)
- Portal vein systems
- Portal venous systems
The portal venous system refers to the vessels involved in the drainage of the capillary beds of the GI tract and spleen into the capillary bed of the liver.
Blood flow to the liver is unique in that it receives both oxygenated and deoxygenated blood. As a result, the partial pressure of oxygen (pO2) and perfusion pressure of portal blood are lower than in other organs of the body. Blood passes from branches of the portal vein through cavities between hepatocellular sinusoids. Blood also flows from branches of the hepatic artery and mixes in the sinusoids to supply the hepatocytes with oxygen. This mixture percolates through the sinusoids and collects in a central vein which drains into the hepatic veins. The hepatic veins subsequently drain into the inferior vena cava.
In infants and young children, valves are present within the portovenous system. However, such valves regress during adulthood.
Terminology
A portal venous system is one in which veins connect two capillary beds; or in other words drain one organ/organ system and pass into another organ/organ system rather than being directly returned to the heart. The hepatic portal vein is the only portal system many are aware of. However, there is also a hypophyseal portal system which passes blood from the hypothalamus to the anterior pituitary 1. Therefore, strictly speaking the system draining the GI tract and passing to the liver should be termed the hepatic portal venous system to distinguish it from the less well-known hypothalamic-pituitary portal system.
References
- 1. Gray's Anatomy. Churchill Livingstone. (2011) ISBN:0443066841. Read it at Google Books - Find it at Amazon
- 2. Stephanie Ryan, Michelle McNicholas, Stephen J. Eustace. Anatomy for Diagnostic Imaging. (2011) Page 193. ISBN: 9780702029714 - Google Books
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