What Is the Portal Venous System?

The portal vein system is a collective term for the collection of functional blood vessels in the liver. It is formed by the fusion of the superior mesenteric vein and the splenic vein. In addition to metabolic energy, new substances are also synthesized to supply the needs of the whole body tissues.

Portal vein system

The portal vein system is a collective term for the collection of functional blood vessels in the liver. It is formed by the fusion of the superior mesenteric vein and the splenic vein. In addition to metabolic energy, new substances are also synthesized to supply the needs of the whole body tissues.

Chinese name

Portal vein system

Reference books

Anatomy and Histology and Embryology

Make up

Conjunction of superior mesenteric and splenic veins

Function

Metabolizable energy

Anastomosis of portal vein and superior vena cava

Its starting and ending ends are capillaries, starting from the capillary network of the stomach, intestine, pancreas, and spleen, and ending at the liver sinusoidal space. And the portal vein trunk and larger branch branches have no valve structure

There are many communication branches between the portal vein and vena cava. In portal hypertension, in order to make blood stagnant in the portal vein system ^[1] return, these communication branches are opened in large numbers, and the collateral circulation is established. The main collateral circulation is: 1. Varicose veins in the lower part of the esophagus and the gastric fundus; 2. Reopening of the umbilical vein; 3. The hemorrhoid veins of the portal vein line with the middle and lower hemorrhoid veins of the vena cava line to form a hemorrhoid core.