The vertebrobasilar system supplies the brainstem, cerebellum, and the posterior inferior portion of the cerebrum. This describes which circulation?

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Understanding brain vascular territories: the vertebrobasilar system is the posterior circulation. It runs from the vertebral arteries up to the basilar artery and then via the posterior cerebral arteries to nourish the brainstem, cerebellum, and the posterior portions of the cerebrum (including the occipital lobes). That described distribution matches posterior circulation precisely. The other options refer to different concepts: the carotid/anterior circulation involves the internal carotid system; anterior cerebral artery syndrome is a deficit pattern from occlusion of the anterior circulation; split-brain syndrome is a neuropsychological condition from severed interhemispheric connections, not a vascular territory.