Where are the four sites of the portal systemic anastomoses?
|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)|
How does blood flow through the portal venous system?
The umbilical vein drains into the left portal vein, and the cystic vein from the gallbladder drains into the right portal vein. The portal venules drain into hepatic sinusoids that, in turn, are drained by the hepatic veins into the inferior vena cava.
What is the portal venous system?
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.
What is the pathway of hepatic portal circulation?
The venous blood from the GI tract drains into the superior and inferior mesenteric veins; these two vessels are then joined by the splenic vein just posterior to the neck of the pancreas to form the portal vein. This then splits to form the right and left branches, each supplying about half of the liver.
What are included in the portal systemic anastomoses?
The major portal-systemic anastomoses include: 1) esophageal branches of left gastric vein with esophageal veins, 2) superior rectal vein with middle and inferior rectal veins, 3) paraumbilical veins with subcutaneous veins of anterior abdominal wall, 4) retroperitoneal veins with venous branches of veins of the colon …
What is portal 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 enables the blood to still reach the systemic venous circulation.
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 does the hepatic portal system connect?
In the second system, the hepatic portal circulation, capillaries originating in the gastrointestinal tract and the spleen merge to form the portal vein, which enters the liver and divides to form portal capillaries.
What is the portal circulation?
The portal vein drains almost all of the blood from the digestive tract and empties directly into the liver. This circulation of nutrient-rich blood between the gut and liver is called the portal circulation.
What is portal and systemic circulation?
What are the steps of systemic circulation?
In the systemic circulation, blood travels out of the left ventricle, to the aorta, to every organ and tissue in the body, and then back to the right atrium. The arteries, capillaries, and veins of the systemic circulatory system are the channels through which this long journey takes place.
How many types of portal systems are there?
Lower vertebrates have two so-called portal systems, areas of the venous system that begin in capillaries in tissues and join to form veins, which divide to produce another capillary network en route to the heart. They are called the hepatic (liver) and renal (kidneys) portal systems.
What are the branches of the portal vein?
The most common variant is the so called “portal vein trifurcation” where the main portal vein divides into three branches: the left portal vein, the right anterior portal vein, and the right posterior portal vein (type 2, Fig.
What two organs are connected to the hepatic portal vein?
The hepatic portal vein is a vessel that moves blood from the spleen and gastrointestinal tract to the liver.
What are the 3 portal systems of the body?
Portal venous systems are considered venous because the blood vessels that join the two capillary beds are either veins or venules. Examples of such systems include the hepatic portal system, the hypophyseal portal system, and (in non-mammals) the renal portal system.
What is the correct order for the flow of blood entering from systemic circulation quizlet?
– Deoxygenated blood from the systemic circulation enters the left atrium. – Once in the heart, deoxygenated blood is pumped from the right atrium to the right ventricle. – Once in the heart, deoxygenated blood is pumped from the left atrium to the left ventricle. – Oxygenated blood enters the left atrium.
What is the structure of the hepatic portal system?
The hepatic portal system consists of: Hepatic portal vein: This is the main vein connected to the liver. It forms at the connection of the inferior and superior mesenteric veins. Inferior mesenteric vein: This vein takes blood from the colon and rectum and connects with the portal vein.
Where does the hepatic portal system begin and end?
The hepatic portal system is the venous system that returns blood from the digestive tract and spleen to the liver (where raw nutrients in blood are processed before the blood returns to the heart).
What is portosystemic anastomosis?
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.
What is login sequence diagram of job portal system?
This is the Login Sequence Diagram of Job Portal System, where admin will be able to login in their account using their credentials. After login user can manage all the operations on Registration, Interview, Search Job, Job, Call Letter. All the pages such as Search Job, Job, Call Letter are secure and user can access these page after login.
What is the anastomosis of the colonic vein?
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 different types of anastomosis?
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.