The three basic regions of the cerebrum are the cerebral cortical gray matter

a) Myelinated nerve fibres

b) The white matter

c) gray matter

Explanation:

The three main parts of cerebral hemispheres are

a) Myelinated nerve fibers

b) The white matter

c) Gray matter

The nerve fibers of the white matter are responsible for connecting the functional parts of cerebral cortex while the gray matter is further divided into four surface folds/lobes with each lobe associated with a specific activity. Such as frontal lobe take cares of motor activity and speech, parietal lobe is responsible for touch and position sensation, occipital lobe for vision and temporal lobe for hearing.