Lumbar Arteries Flashcards

Explore the origins, segmental course, branches, anatomical relations, and vascular supply of the lumbar arteries.

Card 1 of 25Question

What are the lumbar arteries?

Paired segmental arteries supplying the posterior abdominal wall and adjacent structures.

In This Section

1. What are the lumbar arteries?

Paired segmental arteries supplying the posterior abdominal wall and adjacent structures.

2. How are the lumbar arteries classified among the branches of the abdominal aorta?

Paired parietal branches.

3. How many pairs of lumbar arteries typically arise directly from the abdominal aorta?

Four pairs.

4. From which surface of the abdominal aorta do the lumbar arteries typically arise?

The posterolateral surface.

5. Which vessel commonly gives rise to the fifth pair of lumbar arteries?

The median sacral artery, although the origin is variable.

6. At approximately which vertebral levels do the four aortic pairs of lumbar arteries originate?

Near the first four lumbar vertebrae, L1 to L4.

7. In which general direction do the lumbar arteries travel after arising from the aorta?

Laterally and posteriorly around the lumbar vertebral bodies.

8. Why are the right lumbar arteries generally longer than the left?

The abdominal aorta lies to the left of the vertebral column.

9. Which major vein do the right lumbar arteries pass posterior to?

The inferior vena cava.

10. Which muscle lies anterior to the lumbar arteries as they pass laterally along the vertebral bodies?

The psoas major muscle.

11. Which principal branches arise from a typical lumbar artery?

A dorsal branch and a continuation toward the anterolateral abdominal wall.

12. What structures are primarily supplied by the dorsal branches of the lumbar arteries?

The deep muscles and skin of the lumbar region of the back.

13. Which branch of a lumbar artery enters an intervertebral foramen?

The spinal branch arising from the dorsal branch.

14. What structures receive blood from the spinal branches of the lumbar arteries?

Vertebrae, spinal meninges, nerve roots, and parts of the spinal cord.

15. Which muscles of the anterolateral abdominal wall receive blood from the lumbar arteries?

The transversus abdominis and internal and external oblique muscles.

16. Between which two abdominal wall muscle layers do the lumbar arteries commonly continue laterally?

Between the transversus abdominis and internal oblique muscles.

17. Which arteries form superior anastomotic connections with the upper lumbar arteries?

The subcostal arteries.

18. Which artery from the internal iliac system anastomoses with the lower lumbar arteries?

The iliolumbar artery.

19. Which abdominal wall artery can anastomose with the lateral branches of the lumbar arteries?

The deep circumflex iliac artery.

20. What is the functional importance of anastomoses between the lumbar arteries and adjacent arterial systems?

They provide collateral pathways for blood flow to the trunk and abdominal wall.

21. What are segmental medullary arteries associated with the lumbar arterial system?

Vessels that accompany spinal nerve roots and reinforce the longitudinal spinal arteries.

22. Which major spinal cord artery may occasionally originate from a lumbar segmental artery?

The great anterior segmental medullary artery, also called the artery of Adamkiewicz.

23. Why is preservation of significant lumbar segmental arteries important during aortic surgery?

Their spinal branches may contribute to spinal cord perfusion.

24. Why can lumbar arteries be injured during retroperitoneal or lumbar spine procedures?

They course close to the vertebral bodies and posterior abdominal wall muscles.

25. What type of hemorrhage can result from rupture or injury of a lumbar artery?

Retroperitoneal hemorrhage, potentially producing a psoas hematoma.