This report describes the normal arterial patterns of the vestibulocer
ebellar regions visualized by magnetic resonance angiography. Variatio
ns in the vertebrobasilar arterial system are described, limitations i
n imaging are discussed, and collateral connections within the cerebel
lar vessels and the circle of Willis are reviewed. Clinical correlatio
ns are de fined between the vestibular nuclei, the associated intraaxi
al tracts, and with specific posterior cerebral and brain stem arterie
s.