Left Colic Artery Flashcards

Examine the left colic artery, its inferior mesenteric origin, ascending and descending branches, colonic supply, and vascular connections.

Card 1 of 25Question

What is the left colic artery?

An artery that primarily supplies the descending colon and contributes to the blood supply of the splenic flexure.

In This Section

1. What is the left colic artery?

An artery that primarily supplies the descending colon and contributes to the blood supply of the splenic flexure.

2. From which major artery does the left colic artery typically originate?

The inferior mesenteric artery.

3. What is the usual branching position of the left colic artery along the inferior mesenteric artery?

It is typically the first major branch.

4. Which embryological division of the gastrointestinal tract is supplied by the left colic artery?

The hindgut.

5. In which general direction does the left colic artery travel after its origin?

Laterally toward the left side of the abdomen.

6. Which retroperitoneal structure does the left colic artery typically cross anterior to?

The left ureter.

7. Which muscle lies posterior to the left colic artery along part of its course?

The left psoas major muscle.

8. Into which two principal branches does the left colic artery commonly divide?

Ascending and descending branches.

9. Which colonic regions are primarily supplied by the ascending branch of the left colic artery?

The upper descending colon and splenic flexure.

10. Which artery typically anastomoses with the ascending branch of the left colic artery?

The left branch of the middle colic artery.

11. From which major artery does the middle colic artery arise?

The superior mesenteric artery.

12. Which region of the colon is principally supplied by the descending branch of the left colic artery?

The lower descending colon.

13. Which arteries anastomose with the descending branch of the left colic artery?

The sigmoid arteries.

14. To which continuous arterial network does the left colic artery contribute?

The marginal artery of the colon, also called the marginal artery of Drummond.

15. Where is the marginal artery located in relation to the colon?

Along the mesenteric border of the colon.

16. What is the functional importance of the left colic artery's connection with the middle colic artery?

It provides collateral circulation between the superior and inferior mesenteric arterial territories.

17. What is Griffith's point?

A potential watershed region near the splenic flexure between the middle colic and left colic arterial territories.

18. Why is the splenic flexure particularly vulnerable to ischemia?

Collateral circulation between the superior and inferior mesenteric territories may be insufficient during reduced perfusion.

19. What is the arc of Riolan?

A variable central mesenteric collateral connection between the middle colic and left colic arterial systems.

20. Which vein commonly accompanies the left colic artery?

The left colic vein, which drains into the inferior mesenteric venous system.

21. Where are lymph nodes associated with the left colic artery located?

Along the left colic vessels within the mesocolon.

22. What anatomical variation may occur in the origin of the left colic artery?

It may arise from a common trunk with a sigmoid artery rather than as a separate branch.

23. Why is preservation of the left colic artery sometimes important during sigmoid or rectal resection?

It may help maintain arterial perfusion to the remaining descending colon and colorectal anastomosis.

24. What is the difference between high and low ligation of the inferior mesenteric artery in relation to the left colic artery?

High ligation divides the inferior mesenteric artery proximal to the left colic origin, while low ligation preserves the left colic artery.

25. Why must the left ureter be identified during surgical dissection of the left colic arterial pedicle?

Its close anatomical relationship places it at risk of inadvertent injury.