DefinitionVertebrobasilar circulatory disorders are conditions in which blood supply to the back of the brain is disrupted.See also:Transient ischemic attackStrokeAlternative NamesVertebrobasilar insufficiency; Posterior circulation ischemiaCauses, incidence, and risk factorsThe vertebrobasilar system is also called the back (posterior) circulation of the brain. Three main blood vessels provide blood flow to the back of the brain:One basilar arteryTwo vertebral arteriesThe back of the brain contains structures that are crucial for keeping a person alive. For instance, the brainstem controls breathing and swallowing, among other things. Parts of the brain help with vision (occipital lobes) and movement coordination (cerebellum) are also located in the back of the brain.Many different condit