Anterior Circulation
Carotid Circulation (through carotid foramen)
Posterior Circulation
Vertebral/basilar circulation
Brainstem supply
Posterior circulation ONLY
Cerebral Hemisphere supply
Anterior AND posterior circulation
Spinal cord Supply
Systemic circulation and Vertebral arteries
Cerebellum supply
Basilar system: PICA, Long circumferential branches, AICA, superior cerebellar artery