Which artery primarily supplies the hippocampus?

• A. Posterior cerebral artery (PCA) territory.
• B. Anterior cerebral artery.
• C. Middle cerebral artery.
• D. Basilar artery.

Answer: (A)

The main concept here is the vascular supply of the hippocampus. The hippocampus sits in the medial temporal lobe and is fed mainly by branches of the posterior cerebral artery. These hippocampal arteries reach into the hippocampal formation to provide most of its blood supply. In contrast, the anterior cerebral artery supplies the medial frontal and parietal regions, the middle cerebral artery covers the lateral temporal and much of the lateral cortex, and the basilar artery feeds the brainstem and cerebellum. Because the hippocampus relies predominantly on the posterior cerebral artery, PCA territory involvement is the classic pattern in ischemic events affecting memory-related structures.