Blood supply to the brain (circle of Willis)
The anatomy of the blood supply to the brain, including the circle of Willis (or circulus arteriosus). I talk about the vertebral and internal carotid arteries, the basilar artery and the circle of Willis, and mention the cerebral and cerebellar arteries, the bloodbrain barrier and the idea of cerebral perfusion pressure. See also this online thing Steve Atherton and I made: Music by Broke for Free (Licensed for use under Creative Commons Licenses, see above links for details).
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