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Sketch of the base of the brain showing the intracranial vertebral and basilar arteries and their branches. The brain is divided into proximal, middle, and distal intracranial territories. ASA; anterior spinal artery, PICA; posteroinferior cerebellar artery, AICA; anteroinferior cerebellar artery, SCA; superior cerebellar artery, PCA; posterior cerebral artery. Redrawn by Laurel Cook-Lowe with permission from Duvernoy HM. Human Brainstem Vessels. Berlin: Springer-Verlag, 1978.
