Spinal cord blood supply

1. What arteries provide blood to the posterior 1/3 of the spinal cord?
2. What arteries provide blood to the anterior 2/3 of the spinal cord? From what arteries do they arise?
3. What arteries serve as reinforcement for the spinal arteries?
4. What is the major source of blood to the lower anterior 2/3 of the spinal cord?

Answers:
1. Posterior spinal arteries.
2. Anterior spinal arteries, which arise from the vertebral arteries and unite to form a single artery.
3. The radicular arteries.
4. The artery of Adamkiewicz.