Where do portosystemic anastomoses occur?

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 Cava caval anastomosis?

Cavocaval anastomoses They are the links between v. cava superior and v. cava inferior.

What is the caval system in anatomy?

Definition. A type of anastomoses which occurs between the veins of portal circulation and veins of systemic circulation. Supplement. Examples of this are: esophageal varices, haemorrhoids, and caput medusae.

What do you mean by anastomosis?

An anastomosis is a surgical connection between two structures. It usually means a connection that is created between tubular structures, such as blood vessels or loops of intestine. For example, when part of an intestine is surgically removed, the two remaining ends are sewn or stapled together (anastomosed).

What are portosystemic collaterals?

Portosystemic shunts, also known as portosystemic collaterals, are abnormal communications between the portal system and the systemic circulation, and such shunts can be congenital or acquired(7,8). Congenital shunts can be intrahepatic or extrahepatic, and their classification is complex.

What is portosystemic shunt?

A portosystemic shunt (PSS) is an abnormal connection between the portal vascular system and systemic circulation. This means that a portion of the toxins, proteins and nutrients absorbed by the intestines bypass the liver and are shunted directly into the systemic circulation.

What is caval caval shunt?

A portacaval shunt (or portal caval shunt) is a treatment for portal hypertension. A connection is made between the portal vein, which supplies 75% of the liver’s blood, and the inferior vena cava, the vein that drains blood from the lower two-thirds of the body.

What are Perisplenic varices?

PERISPLENIC VARICES AND SPLENORENAL AND SPLENOCAVAL/SPLENOAZYGOS SHUNTS. Splenic varices usually traverse the splenocolic ligament and are seen as dilated veins in the anteroinferior aspect of the spleen[20]. Perisplenic collaterals can communicate with the gastric veins.

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.

What is a portosystemic shunt?

Portosystemic shunts (PSSs) are vascular anomalies that connect the portal circulation with the systemic circulation, diverting portal blood away from the liver. 30. What is a portosystemic shunt (PSS)?

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.

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).