Superior Mesenteric Vein Flashcards

Study the superior mesenteric vein, including its formation, intestinal tributaries, pancreatic relations, portal drainage, and clinical anatomy.

Card 1 of 30Question

What is the superior mesenteric vein?

A major portal venous tributary that drains much of the small intestine and right side of the large intestine.

In This Section

1. What is the superior mesenteric vein?

A major portal venous tributary that drains much of the small intestine and right side of the large intestine.

2. Which regions of the gastrointestinal tract are primarily drained by the superior mesenteric vein?

The small intestine, cecum, appendix, ascending colon, and proximal transverse colon.

3. Where does the superior mesenteric vein originate?

In the mesentery, where intestinal venous tributaries converge near the terminal ileum and ileocecal region.

4. What is the general direction of the superior mesenteric vein?

It ascends from the lower right abdomen toward the pancreatic neck.

5. Which artery commonly accompanies the superior mesenteric vein?

The superior mesenteric artery.

6. What is the usual relationship of the superior mesenteric vein to the superior mesenteric artery?

The vein usually lies to the right of the artery.

7. Through which peritoneal structure do the superior mesenteric vessels travel?

The root of the mesentery of the small intestine.

8. Which part of the duodenum lies posterior to the superior mesenteric vessels?

The horizontal third part of the duodenum.

9. What is the relationship of the superior mesenteric vein to the uncinate process of the pancreas?

The superior mesenteric vein passes anterior to the uncinate process.

10. Where does the superior mesenteric vein usually terminate?

Posterior to the pancreatic neck, where it joins the splenic vein.

11. Which major vein is formed by the union of the superior mesenteric vein and splenic vein?

The hepatic portal vein.

12. Which venous tributaries drain the jejunum into the superior mesenteric vein?

The jejunal veins.

13. Which venous tributaries drain the ileum into the superior mesenteric vein?

The ileal veins.

14. Which vein drains the terminal ileum, cecum, and appendix?

The ileocolic vein and its tributaries.

15. Which vein commonly drains the ascending colon into the superior mesenteric vein?

The right colic vein, when present, with additional drainage through the ileocolic and middle colic veins.

16. Which vein primarily drains the proximal transverse colon?

The middle colic vein.

17. Which veins drain the pancreatic head and duodenum into the superior mesenteric venous system?

The pancreaticoduodenal veins, especially branches of the inferior pancreaticoduodenal veins.

18. Which vein drains part of the greater curvature of the stomach into the superior mesenteric venous system?

The right gastro-omental vein, also called the right gastroepiploic vein.

19. What is the gastrocolic trunk of Henle?

A variable venous confluence near the pancreatic head that commonly drains into the superior mesenteric vein.

20. Which veins commonly contribute to the gastrocolic trunk of Henle?

The right gastro-omental vein and colic or pancreaticoduodenal tributaries, with considerable anatomical variation.

21. Can the inferior mesenteric vein drain directly into the superior mesenteric vein?

Yes. This is a recognized variation, although the inferior mesenteric vein more commonly drains into the splenic vein.

22. Does the superior mesenteric vein normally contain functional valves?

No. It is normally valveless.

23. How does blood from the superior mesenteric vein reach the liver?

It enters the hepatic portal vein and flows through intrahepatic portal branches into hepatic sinusoids.

24. What is superior mesenteric vein thrombosis?

Formation of a blood clot within the superior mesenteric vein, obstructing intestinal venous drainage.

25. Why can superior mesenteric vein thrombosis cause intestinal ischemia?

Venous obstruction causes bowel wall congestion, edema, and impaired tissue perfusion, potentially progressing to infarction.

26. Which imaging technique is commonly used to diagnose superior mesenteric vein thrombosis?

Contrast-enhanced computed tomography during the portal venous phase.

27. Why is the superior mesenteric vein an important landmark during pancreatic surgery?

It lies close to the pancreatic head, neck, and uncinate process, making it essential for surgical dissection and vascular assessment.

28. Why must surgeons identify the gastrocolic trunk of Henle during right-sided colorectal surgery?

Its variable tributaries are vulnerable to injury and may cause significant bleeding during mesocolic dissection.

29. What is the clinical significance of tumor involvement of the superior mesenteric vein?

Tumor invasion or narrowing may affect surgical resectability and require venous reconstruction.

30. Why is the superior mesenteric vein important in evaluating portal hypertension?

It is a major contributor to portal blood flow, and its patency and collateral pathways influence portal circulation.