What is the Circle of Willis primarily known for?

The Circle of Willis is primarily known for its role in supplying blood to the brain. This structure is a circular network of arteries located at the base of the brain, providing a critical point of convergence for blood flow from various major arteries. It connects the internal carotid arteries and the basilar artery, ensuring that all parts of the brain receive an adequate blood supply, even if one of the key vessels becomes obstructed or narrowed. This redundancy is particularly important for maintaining cerebral perfusion under changing physiological conditions or in the event of vascular diseases that may compromise blood flow.

The other options do not accurately describe the primary function of the Circle of Willis. While the anatomy of the Circle of Willis has implications for cerebrospinal fluid flow and neural connections, its foremost significance lies in blood supply, making this the correct answer.