## **Core Concept**
The hippocampus, a crucial structure for memory formation, receives its arterial supply primarily from branches of the **posterior cerebral artery** and, to a lesser extent, from the **anterior cerebral artery**. Understanding the arterial supply of the hippocampus is essential for neurology and neurosurgery, especially in cases of stroke or temporal lobe surgery.

## **Why the Correct Answer is Right**
The correct answer, **. (Posterior cerebral artery)**, is right because the posterior cerebral artery (PCA) provides the primary arterial supply to the hippocampus. The PCA branches into several important arteries, including the **hippocampal arteries**, which directly supply the hippocampus. This vascular supply is critical for the function and viability of hippocampal neurons.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While the **anterior cerebral artery (ACA)** does supply parts of the brain, including the medial surface of the frontal and parietal lobes, it is not the primary arterial supplier of the hippocampus.
- **Option B:** This option might seem plausible due to the complex anastomotic network in the brain, but it is not directly related to the primary arterial supply of the hippocampus.
- **Option D:** Similarly, this option does not directly correspond to the primary arterial supply of the hippocampus.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that the **hippocampus is highly susceptible to ischemic damage** due to its rich but delicate vascular supply. This susceptibility is clinically relevant in conditions such as transient global amnesia and Alzheimer's disease, where hippocampal dysfunction plays a critical role.

## **Correct Answer Line**
**Correct Answer: C. Posterior cerebral artery.**