Depends on how closely you look at it – a very rough division is in forebrain, midbrain, hindbrain, but you can easily go to 50 or more areas in just one part of the forebrain (the cerebral cortex) if you look at general tissue structure. If you consider any cell in the brain as a “part”, the number for an adult male human brain would be about 170,000,000,000 (half of which being nerve cells).
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