Portal Venous System Flashcards

Explore the hepatic portal venous system, including its formation, tributaries, liver circulation, portosystemic connections, and clinical anatomy.

Card 1 of 30Question

What is the hepatic portal venous system?

A venous network that transports blood from abdominal digestive organs, the spleen, pancreas, and gallbladder to the liver.

In This Section

1. What is the hepatic portal venous system?

A venous network that transports blood from abdominal digestive organs, the spleen, pancreas, and gallbladder to the liver.

2. What is the principal function of the hepatic portal venous system?

To deliver nutrient-rich venous blood from digestive organs to the liver for metabolic processing and detoxification.

3. Which major vessel carries blood into the liver through the portal venous system?

The hepatic portal vein.

4. Which two veins usually unite to form the hepatic portal vein?

The superior mesenteric vein and splenic vein.

5. Where is the hepatic portal vein usually formed?

Posterior to the neck of the pancreas.

6. At approximately which vertebral level is the hepatic portal vein formed?

Near the L1 to L2 vertebral levels.

7. What is the usual course of the hepatic portal vein?

It ascends behind the first part of the duodenum and then travels within the hepatoduodenal ligament toward the liver.

8. Which peritoneal ligament contains the hepatic portal vein?

The hepatoduodenal ligament, which forms the free edge of the lesser omentum.

9. What is the relationship of the portal vein to the other structures of the portal triad?

The portal vein lies posterior to the proper hepatic artery and bile duct.

10. Which structures form the portal triad within the hepatoduodenal ligament?

The hepatic portal vein, proper hepatic artery, and common bile duct.

11. Where does the hepatic portal vein usually divide into its major branches?

At or near the porta hepatis, where it divides into right and left portal branches.

12. Which part of the liver is primarily supplied by the right portal vein?

The functional right liver, with branches supplying its anterior and posterior sectors.

13. Which part of the liver is primarily supplied by the left portal vein?

The functional left liver, through branches supplying its medial and lateral sectors.

14. Which vein drains much of the small intestine and right side of the large intestine?

The superior mesenteric vein.

15. Which major organs contribute venous blood to the splenic vein?

The spleen, pancreas, and portions of the stomach.

16. Which vein drains the descending colon, sigmoid colon, and upper rectum?

The inferior mesenteric vein.

17. Where does the inferior mesenteric vein usually terminate?

In the splenic vein, although it may drain into the superior mesenteric vein or their confluence.

18. Which veins drain much of the lesser curvature of the stomach into the portal system?

The left and right gastric veins.

19. Which vein carries venous blood from the superior part of the rectum into the portal system?

The superior rectal vein, which continues into the inferior mesenteric vein.

20. Where does portal venous blood flow after entering the liver?

Through progressively smaller portal branches into hepatic sinusoids.

21. How does portal venous blood eventually reach the systemic circulation?

Through hepatic sinusoids, central veins, hepatic veins, and then the inferior vena cava.

22. What proportion of the liver's total blood flow is normally supplied by the portal vein?

Approximately 70% to 75%, with the remainder supplied mainly by the hepatic artery.

23. What is a portosystemic anastomosis?

A venous connection between tributaries of the hepatic portal system and the systemic venous circulation.

24. Which veins form the major portosystemic anastomosis near the lower esophagus?

Tributaries of the left gastric vein communicate with esophageal veins draining into the azygos system.

25. Which veins participate in portosystemic connections within the rectum?

The superior rectal vein communicates with the middle and inferior rectal veins.

26. Which veins form portosystemic connections around the umbilicus?

Paraumbilical veins communicate with superficial abdominal wall veins.

27. What is portal hypertension?

An abnormal elevation of pressure within the portal venous circulation.

28. What is the most common cause of portal hypertension in adults?

Liver cirrhosis, which increases resistance to portal blood flow through the liver.

29. What are esophageal varices?

Dilated submucosal veins in the distal esophagus, commonly caused by portal hypertension and potentially leading to severe bleeding.

30. What is the purpose of a transjugular intrahepatic portosystemic shunt (TIPS)?

To reduce portal pressure by creating a channel between an intrahepatic portal vein branch and a hepatic vein.