Why is the surface in the cerebrum highly folded and grey matter external to white matter ?

Grey matter is

In the spinal cord, white matter is

Grey matter includes:

The gray matter differs from white matter in the :

What is composition of grey matter and white matter?

Write 'T' for true and 'F' for false statements and choose the correct answer i. Cerebellum forms the major part of human brain ii. A deep cleft divided cerebrum transversely into two cerebral hemisphere ? iii. The cerebral cortex is referred to as gray matter. iv. Cerebral hemisphere are connected by tract of nerve fibre called corpus callosum