The three cerebellar arteries arise from the vertebrobasilar system, the lower ones supplying the inferior cerebellar surface and the superior artery supplying the superior surface. The anterior inferior cerebellar artery gives off labyrinthine branches, and all three vessels supply branches to the adjacent brain stem structures along their course.
The cerebral hemispheres are supplied by three sets of vessels, two from the anterior circulation, one from the posterior. The vessels lie within the arachnoid membrane which loosely bridges over the cerebral sulci. The vessels communicate via fine branches at the margins of their territories.
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