## **Core Concept**
The infratentorial dura mater, which is part of the meningeal layer covering the posterior cranial fossa, receives its blood supply from specific arterial branches. Understanding the blood supply to different parts of the dura mater is crucial in neurosurgery and neurology.

## **Why the Correct Answer is Right**
The correct answer, **C. occipital and vertebral arteries**, is accurate because the infratentorial dura mater, which covers the posterior aspect of the brain and the cerebellum, is primarily supplied by branches from the occipital and vertebral arteries. The occipital artery, a branch of the external carotid artery, provides several branches to the dura mater in the posterior cranial fossa. The vertebral artery, which arises from the subclavian artery and ascends through the neck to supply the posterior circulation of the brain, also gives off meningeal branches to the dura mater.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not specify known suppliers of the infratentorial dura.
- **Option B:** This option is incorrect as it does not accurately represent the primary blood supply to the infratentorial dura mater.
- **Option D:** This option is incorrect because it does not accurately describe the arterial supply to the infratentorial dura.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the blood supply to the dura mater can be critical in cases of intracranial hemorrhage or during neurosurgical procedures. The meningeal branches of the occipital and vertebral arteries are important for supplying the infratentorial dura.

## **Correct Answer:** C. occipital and vertebral arteries