Superior Mesenteric Artery Flashcards

Study the superior mesenteric artery, its aortic origin, anatomical course, major branches, midgut supply, and vascular relationships.

Card 1 of 30Question

What is the superior mesenteric artery?

A major unpaired visceral branch of the abdominal aorta that supplies most of the midgut.

In This Section

1. What is the superior mesenteric artery?

A major unpaired visceral branch of the abdominal aorta that supplies most of the midgut.

2. From which vessel does the superior mesenteric artery originate?

The abdominal aorta.

3. At approximately which vertebral level does the superior mesenteric artery arise?

The L1 vertebral level.

4. From which surface of the abdominal aorta does the superior mesenteric artery arise?

The anterior surface.

5. Which major unpaired visceral artery arises immediately superior to the superior mesenteric artery?

The celiac trunk.

6. Which embryological division of the gastrointestinal tract is supplied by the superior mesenteric artery?

The midgut.

7. Which intestinal structures receive their principal arterial supply from the superior mesenteric artery?

The distal duodenum, jejunum, ileum, cecum, appendix, ascending colon, and proximal transverse colon.

8. What is the relationship of the superior mesenteric artery to the neck of the pancreas?

It passes posterior to the pancreatic neck.

9. Which major vein lies posterior to the origin of the superior mesenteric artery?

The left renal vein.

10. What is the relationship of the superior mesenteric artery to the third part of the duodenum?

It crosses anterior to the horizontal part of the duodenum.

11. Which major vein typically lies to the right of the superior mesenteric artery?

The superior mesenteric vein.

12. Within which peritoneal structure does the superior mesenteric artery descend toward the small intestine?

The root of the mesentery of the small intestine.

13. What are the major branches of the superior mesenteric artery?

Inferior pancreaticoduodenal, jejunal, ileal, middle colic, right colic, and ileocolic arteries.

14. Which branch of the superior mesenteric artery supplies the inferior pancreatic head and adjacent duodenum?

The inferior pancreaticoduodenal artery.

15. Which branches of the superior mesenteric artery supply most of the jejunum and ileum?

The jejunal and ileal arteries.

16. From which side of the superior mesenteric artery do the jejunal and ileal branches typically arise?

The left side.

17. What are the arterial arcades formed by the jejunal and ileal branches?

Interconnected arterial loops within the mesentery that distribute blood to the small intestine.

18. What are the vasa recta of the small intestine?

Straight arterial branches extending from the mesenteric arcades to the intestinal wall.

19. How do jejunal arterial arcades typically differ from ileal arterial arcades?

Jejunal arcades are generally fewer and simpler, whereas ileal arcades are more numerous and complex.

20. Which branch of the superior mesenteric artery primarily supplies the transverse colon?

The middle colic artery.

21. Which branch of the superior mesenteric artery supplies the ascending colon and is frequently anatomically variable?

The right colic artery.

22. Which branch of the superior mesenteric artery supplies the terminal ileum, cecum, and appendix?

The ileocolic artery.

23. Which artery typically gives rise to the appendicular artery?

The ileocolic artery or one of its cecal branches.

24. Which arterial networks connect the superior mesenteric artery with the celiac trunk territory?

The anterior and posterior pancreaticoduodenal arterial arcades.

25. How does the superior mesenteric artery communicate with the inferior mesenteric artery territory?

Through colic arterial anastomoses, including the marginal artery and variable arc of Riolan.

26. Which autonomic nerve plexus accompanies the superior mesenteric artery and its branches?

The superior mesenteric plexus.

27. What is superior mesenteric artery syndrome?

Compression of the third part of the duodenum between the superior mesenteric artery and abdominal aorta.

28. What is a recognized variation involving the common hepatic artery and superior mesenteric artery?

The common hepatic artery may arise from the superior mesenteric artery as part of a hepatomesenteric trunk.

29. What is the principal consequence of acute superior mesenteric artery occlusion?

Acute mesenteric ischemia, potentially progressing to extensive intestinal infarction.

30. Why is identifying superior mesenteric artery branching variations important during intestinal and colorectal surgery?

Accurate vascular mapping helps preserve intestinal perfusion and prevent inadvertent arterial injury.