eli5 What is the difference between white matter and grey matter in the brain?
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Grey matter is mostly on the surface of the brain. It’s where the processing in your brain actually happens. It’s grey because there’s more cell bodies there to process information.
White matter is mostly the interior. It routes information around the brain and doesn’t do much processing, if any. It doesn’t really have that many cell bodies, it has long spindly wire like things called axons that connect cell bodies together. It’s white because those axons have a layer of fat over them.
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