Tag: Circle of Willis

November 9, 2025 / Mohammed looti

ARTERIAL CIRCLE

Introduction and Definition of the Arterial Circle The Arterial Circle, more commonly known in medical literature as the Circle of Willis, represents a critical anastomosis—a circulatory communication—of blood vessels situated at the base of the brain, surrounding the optic chiasm and the hypothalamus. This intricate ring structure is fundamentally important to human physiology, serving as […]

November 4, 2025 / Mohammed looti

POSTERIOR COMMUNICATING ARTERY

Introduction and Anatomical Context The Posterior Communicating Artery (PCoA) represents a pivotal anatomical structure within the cerebral vasculature, serving as a critical anastomosis that bridges the anterior and posterior circulatory systems of the brain. Originating from the internal carotid artery (ICA), this relatively short but vitally important vessel courses posteriorly to connect with the posterior […]