Where are the Portosystemic anastomosis?
Where are the Portosystemic anastomosis?
Portosystemic anastomosis
| Lower esophagus | Left gastric veins (portal system) -> lower branches of oesophageal veins (systemic veins) |
|---|---|
| Upper part of anal canal | Superior rectal veins (portal) -> inferior and middle rectal veins (systemic) |
| Umbilicus | Paraumbilical veins (portal) -> epigastric veins (systemic) |
Where are the four sites of the portal systemic anastomoses?
It is the point of convergence for the venous drainage of the spleen, pancreas, gallbladder and the abdominal part of the gastrointestinal tract. The portal vein is formed by the union of the splenic vein and the superior mesenteric vein, posterior to the neck of the pancreas, at the level of L2.
What is proto systemic anastomosis?
A portocaval anastomosis is a specific type of anastomosis that occurs between the veins of the portal circulation and those of the systemic circulation. The inferior end of the esophagus and the superior part of the rectum are potential sites of a harmful portacaval anastomosis.
What is the portal caval system?
A type of anastomoses which occurs between the veins of portal circulation and veins of systemic circulation. Examples of this are: esophageal varices, haemorrhoids, and caput medusae.
Which is the best description of portocaval anastomosis?
Porto-systemic anastomosis also known as portocaval anastomosis is the collateral communication between the portal and the systemic venous system.
Where does portosystemic anastomosis drain into the liver?
It penetrates in the right border of the lesser omentum and continues upwards in front (anterior) of the epiploic foramen to reach the porta hepatis (transverse fissure on the liver). After it reaches the porta hepatis, it bifurcates into a right and left branch which penetrates the liver. Various veins drain into the portal vein. These veins are:
Which is collateral communication between Portal and systemic venous system?
Portosystemic anastomosis. Porto-systemic anastomosis also known as portocaval anastomosis is the collateral communication between the portal and the systemic venous system. Portal venous system. The portal venous system transmits deoxygenated blood from most of the gastrointestinal tract and gastrointestinal organs to the liver.
Where is the anastomosis between the omental and colonic veins?
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). This is very rare and at the site of patent ductus venosus.