VASCULAR REGULATION IN THE BRAIN 



245 



blood pressure, then the reflex cerebral vascular dilatation is followed by 

 vaso-constriction which takes place while the general blood pressure is yet 

 high. Weber suggests that this local vaso-constrictor mechanism provides 



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an apparatus for the regulation and control of the cerebral congestion 

 that results from the rise of general blood pressure due to the operation of 

 the general medullary vaso-motor center. 



