The Circle of Willis is a critical arterial anastomotic ring located at the base of the brain that provides collateral blood flow between carotid and vertebrobasilar systems to ensure cerebral perfusion stability under hemodynamic stress. The anatomical theory defines six primary vascular segments comprising anterior, middle, posterior, communicating, and choroidal arteries whose specific nomenclature corresponds strictly to their spatial relationships relative to midline structures like the optic chiasm (ICA) or diencephalic regions (ACA/MCA). This concept belongs to neuroanatomy within the broader discipline of physiology, where understanding these static structural configurations is essential for pathophysiological diagnosis of ischemic strokes and aneurysms.
The Circle of Willis is a critical arterial anastomotic ring located at the base of the brain that provides collateral blood flow between carotid and vertebrobasilar systems to ensure cerebral perfus…