Grey matter is external and white matter is internal in
A
Cerebrum
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B
Olfactory lobes
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C
Diencephalon
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D
All of the above
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Solution
The correct option is D All of the above The major portion of the brain has the myelinated axons of the neurons located beneath the cell bodies and the unmyelinated nerve fibres. So, the white matter is internal and the grey matter is external. The cortex region of the cerebrum and cerebellum that are the main processing regions are made of the grey matter. Similarly, the olfactory lobes, diencephalon etc. also have the grey matter located external to the white matter. The placing reverses in the brainstem and spinal cord.