The developmental aspect brings information on factors of growth and modulation, and about the basic mechanisms of the onset of functions. Contrary to it, ontogenetical research is complicated by factors of variability and large dynamism in the development of the nervous system.At the same time, in the activity of the nervous systeman important role plays plasticity, which is defined as a specific feature of the nervous system to develop or to respond to changes of the external and internal environment or to adjust to them both under physiological and pathological conditions.

        Key words: plasticity - evolution, reactive, adaptation, restoration - neuroontogenesis - brain development.