In the postnatal period the greatest growth in the grey matter of the C.N.S. is of
The brain of newborn weighs approximately 300-350g. By 12 months, it reaches about two-thirds of adult brain. The postnatal growth of cerebral hemispheres results mainly from myelination. Myelination continues long after gray matter has reached a specific volume.
Length of Axon
Neuron cell number
Dendritic tree
Size of Perikaryon
Brain 