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Willis has hairy armpits-the third cranial nerve exits between the posterior cerebral artery and the superior cerebellar artery.
It would have been nice to have an anterior, middle and posterior cerebellar artery, too, but someone inconsiderately named these three arteries differently.
He could have named them after himself- actually, he did, for he was a real SAP (S-superoir cerebellar artery, A- anterior inferior cerebellar artery, P-posterior inferior cerebellar artery).
The cerebellar arteries supply not only the cerebellum but also parts of the brainstem.
Two posterior spinal arteries come off variably from the posterior inferior cerebellar arteries or vertebral arteries and supply the rest of the spinal cord along with anastomoses from intercostal and other arteries.
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