What is portal system anastomosis?

What is portal system anastomosis?

Porto-systemic anastomosis also known as portocaval anastomosis is the collateral communication between the portal and the systemic venous system. The portal venous system transmits deoxygenated blood from most of the gastrointestinal tract and gastrointestinal organs to the liver.

What is portal circulation and systemic circulation?

This circulation of nutrient-rich blood between the gut and liver is called the portal circulation. It enables the liver to remove any harmful substances that may have been digested before the blood enters the main blood circulation around the body—the systemic circulation.

What is Porto cava anastomosis?

A portocaval anastomosis or Porto-systemic anastomosis is a specific type of anastomosis that occurs between the veins of the portal circulation and those of the systemic circulation. When there is a blockage of the portal system, portocaval anastomosis enable the blood to still reach the systemic venous circulation.

What is the purpose of systemic circulation?

The systemic circulation provides the functional blood supply to all body tissue. It carries oxygen and nutrients to the cells and picks up carbon dioxide and waste products. Systemic circulation carries oxygenated blood from the left ventricle, through the arteries, to the capillaries in the tissues of the body.

What does the portal system do?

Portal system is a system of blood vessels that begins and ends in capillaries. Hepatic portal carries nutrients from digestion to the liver to store and metabolize, after a meal.

Does portal vein drain into IVC?

The portal venous drainage and portosystemic venous anastomoses. The superior and inferior mesenteric veins join the splenic vein behind the pancreas to form the portal vein which carries blood to the liver, which in turn is drained by the hepatic veins which pass into the IVC.

What are portal systems?

Definition of a portal system “A portal system is an arrangement by which blood collected from one set of capillaries passes through a large vessel or vessels, to another set of capillaries before returning to the systemic circulation.”

When is a Portacaval shunt used?

Portacaval shunting is a surgical treatment to create new connections between two blood vessels in your abdomen. It is used to treat people who have severe liver problems.

What does a portal system do?

Where is the anastomosis between the portal and epigastric veins?

The anastomosis between the paraumbilical veins, which run in the ligamentum teres as portal veins, and small epigastric veins, which are systemic veins. The site of this anastomosis is the umbilicus.

What is the function of the porto systemic anastomosis?

Function of the porto-systemic anastomosis. Provide alternative routes of venous blood circulation when there is a blockage in the liver or portal vein. Ensure that venous blood from the gastrointestinal tract still reaches the heart through the inferior vena cava without going through the liver.

Where is the anastomosis located in the liver?

The site of this anastomosis is the bare area of the liver. The anastomosis between omental and colonic veins (portal veins) with the retroperitoneal veins (systemic veins) in the region of hepatic and splenic flexure. Another anastomosis is between the ductus venosus (portal vein) and the inferior vena cava (systemic vein).

What are the various anastomoses and where do they occur?

The various anastomoses and the sites in which they occur are described below: The anastomosis between the left gastric veins , which are portal veins, and the lower branches of oesophageal veins that drain into the azygos and hemiazygos veins, which are systemic veins. The site of this anastomosis is the lower oesophagus.