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How many areas are there in Brodmann map?

I read Wikipedia claiming 52. I heard that this can be extended to 54. I see there is no limit of having more areas - just better understanding of the neuroblast migration and fibroblast too, ...
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How can cerebral vasoconstriction lead to decreased O2 supply?

I am thinking the mechanism from hyperventilation into brain damage: hyperventilation [CO2] decreases in plasma cerebral vasoconstriction which then decreases the oxygen supply i.e. [O2] in the ...