In the postnatal period the greatest growth in the grey matter of the C.N.S. is of
Length of Axon
Neuron cell number
Dendritic tree
Size of Perikaryon
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.
Brain 