Spinal cord and nerve roots are supplied by –
**Core Concept**
The spinal cord and nerve roots receive their blood supply from a network of arteries that arise from the aorta and other major arteries. This supply is crucial for the proper functioning of the **central nervous system**. The **anterior spinal artery** and **posterior spinal arteries** play key roles in this supply.
**Why the Correct Answer is Right**
The correct answer involves the specific arteries responsible for supplying the spinal cord and nerve roots. The **vertebral arteries** give rise to the **anterior spinal artery**, which supplies the anterior two-thirds of the spinal cord. The **posterior spinal arteries**, usually branches of the **vertebral arteries** or **posterior inferior cerebellar arteries**, supply the posterior third of the spinal cord.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately represent the primary source of blood supply to the spinal cord and nerve roots.
**Option B:** Similarly, this option is incorrect as it does not correctly identify the arteries involved in supplying the spinal cord and nerve roots.
**Option D:** This option is also incorrect as it fails to specify the correct arteries responsible for the blood supply.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that the blood supply to the spinal cord is segmented, with the **anterior spinal artery** being particularly vulnerable to interruption, which can lead to **anterior spinal artery syndrome**.
**Correct Answer:** Correct Answer: D. Radiculomedullary and radiculopial arteries, which are branches of the aorta and other major arteries that supply the spinal cord and nerve roots.