What are the two pairs of arteries that supply the brain?

It is the Internal carotid and the vertebral arteries. The vertebral arteries join to form the basilar artery which supply the midbrain and the cerebellum. The internal carotid branches divides to form the left and right internal carotids which supply the left and right side of the brain respectively.

Hope this helps...feel free to ask if you don't understand. cheers

Faith