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A Tale of Two Carotid Artery Dissections, and the Miracle of the Circle of Willis - The Stroke Blog
Nature is kind to some, and not so merciful to others. Much of what happens to us on a daily basis stems from chance, and almost every evening I try to reflect at least briefly on my good fortune to have experienced another day with my family, friends, and patients, knowing that it can all change so abruptly. In order to understand the wonder and tragedy that lies within the following anecdote, it is necessary to understand some of the basic vascular anatomy of the brain – the plumbing that enables blood to circulate, that sustains the function and viability of the organ that makes us who we are. There are typically four arteries that bring blood to the brain – an internal carotid artery on each side (A) and a vertebral artery on each side (B); the vertebral arteries join together to form the basilar artery (C), which supplies blood to the brainstem and the back of the brain. The major arteries that extend from the internal carotid arteries in the brain are the middle cerebral arteries (D), and again, there is one on each side. The middle cerebral arteries supply blood to approximately 2/3 of the cerebral hemispheres. Smaller arteries supplying the inner …