What are white matter and gray matter?


Gray matter is the part of brain where cell bodies of nerve cells reside. Normally the gray matter forms the outer part of the brain and certain islands of tissues deep within the brain like basal ganglia nuclei, thalamic nuclei etc. The axons of the cells present within these areas travelling downwards to form the white matter. They form collection of nerve cell axons which are called tracts. These tracts connect various areas of the brain.
The gray matter and white matter are named due to their respective colours in the cut section of brain.
Reference: Madhukar Mohan

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