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Vertebral Artery. The vertebral artery is one of the main arteries at the base of the neck and is the first branch of the subclavian artery. It later unites to create the basilar artery in a complex named the vertebrobasilar system. This system provides important areas of the brain with blood.
These connections form the anterior half (anterior circulation) of the circle of Willis. Posteriorly, the basilar artery, formed by the left and right vertebral arteries, branches into a left and right posterior cerebral artery (PCA), forming the posterior circulation. The PCAs complete the circle of Willis by joining the internal carotid system anteriorly via the posterior communicating (PCOM) arteries.