Middle Colic Artery Flashcards

Examine the middle colic artery, its superior mesenteric origin, mesocolic course, branches, transverse colon supply, and anastomoses.

Card 1 of 26Question

What is the middle colic artery?

An artery that primarily supplies the transverse colon through its right and left branches.

In This Section

1. What is the middle colic artery?

An artery that primarily supplies the transverse colon through its right and left branches.

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

The superior mesenteric artery.

3. From which aspect of the superior mesenteric artery does the middle colic artery usually arise?

The anterior or right anterolateral aspect.

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

The midgut.

5. Which portion of the transverse colon belongs to the embryological midgut territory?

The proximal two-thirds of the transverse colon.

6. In which general direction does the middle colic artery travel after its origin?

Anteriorly and superiorly toward the transverse colon.

7. Within which peritoneal structure does the middle colic artery travel?

The transverse mesocolon.

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

Right and left branches.

9. Which region of the transverse colon is primarily supplied by the right branch of the middle colic artery?

The proximal transverse colon near the hepatic flexure.

10. Which region of the transverse colon receives blood from the left branch of the middle colic artery?

The distal transverse colon toward the splenic flexure.

11. Which artery commonly anastomoses with the right branch of the middle colic artery?

The right colic artery, when present.

12. Which artery typically anastomoses with the left branch of the middle colic artery?

The ascending branch of the left colic artery.

13. From which major artery does the left colic artery arise?

The inferior mesenteric artery.

14. To which arterial network does the middle colic artery contribute along the transverse colon?

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

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

Along its mesenteric border, connecting adjacent colic arterial branches.

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

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

17. What is the arc of Riolan?

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

18. What is Griffith's point?

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

19. Why is the splenic flexure vulnerable to ischemia during reduced mesenteric perfusion?

Collateral flow between the superior and inferior mesenteric territories may be insufficient.

20. Which vein generally accompanies the middle colic artery?

The middle colic vein, which usually drains into the superior mesenteric vein.

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

Along the middle colic vessels within the transverse mesocolon.

22. What is a recognized variation in the origin of the middle colic artery?

It may arise from a common trunk with the right colic artery.

23. What is an accessory middle colic artery?

An additional artery supplying the transverse colon, often arising independently from the superior mesenteric artery.

24. Why is the middle colic artery an important landmark during transverse colectomy?

Its branches guide vascular ligation and preservation of blood supply to the remaining colon.

25. Why is the middle colic arterial pedicle important during colorectal cancer surgery?

Regional lymph nodes follow its vessels and may require removal during oncologic resection.

26. What is a potential consequence of dividing the middle colic artery without adequate collateral circulation?

Ischemia of the remaining transverse colon or an adjacent colonic anastomosis.