Biology
Pie Chart of the Human Brain by Region Volume
Last reviewed on 2026-05-22.
Biology — verifiable data, editable template
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The human brain has several major regions. The cerebrum (which handles thinking and voluntary action) accounts for about 85% of brain mass; the cerebellum and brainstem are smaller but essential.
The data
- Cerebrum — 85 %
- Cerebellum — 10 %
- Brainstem — 3 %
- Diencephalon — 2 %
Source
Standard neuroanatomy references.
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