The central nervous system is generally referred to the brain and the spinal cord. But because we're outside at the moment with a sideic nerve, this is the peripheral nervous system. So I've cut the sideic nerve when looking into it. A lot of it's white. The reason why whenever we see white matter or white stuff in reference to the nervous system, it's referring to insulation. Just like we see all the cords around our house, they're insulated with plastic,. Now, our body insulates the nervous system or the axons with insulation as well. And the myelin can be made by supportive cells which are called glia.

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