U mean EMPTY space?: Normally, none. The 1-2 millimeters between the brain and skull are filled with the three meninges: Dura mater, arachnoid mater and pia mater. This is basic anatomy. Anyone can look it up and learn it the same way med students do in first-year gross anatomy. No special medical expertise is necessary to interpret this information. You can do your own research if you want to know more.
Answered 5/16/2016
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