This book will be helpful to professionals who use the vascular system of the spine, spinal cord, and brain in their practice and in their search for better understanding, reliability, and safety in their decisions and actions by providing a new conceptual approach to the vascular supply to the brain spine and spinal cord. Statements such as "the median cerebral artery is a branch of the anterior cerebral artery" or "the internal carotid and vertebral arteries are minor vessels, they can be absent. They represent the most common distribution pattern to the arterial circle at the base of the brain, but certainly not the only one" show that the authors are far from providing the traditional presentation of the arterial system in man.