In the postnatal period the greatest growth in the grey matter of the C.N.S. is of: (A) Length of Axon, (B) Neuron cell number, (C) Dendritic tree, (D) Size of Perikaryon
Answer is C. 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.