Two-thirds of the brain's weight is made up of the cerebral hemispheres, which are part of the cerebrum. Two hemispheres make up the cerebral hemispheres.
The cerebral cortex is a covering of neuronal tissue that covers the mammalian brain's cerebrum.
Nerve cells can be found in up to six layers.
It is sometimes referred to as grey matter since it is covered by the meninges.
Because nerves in this section lack the insulation (myelin) that makes the rest of the brain seem white, the cortex appears grey.