QUANTITATIVE STUDY OF THE SYNAPSES IN RATS HIPPOCAMPUS DURING THE EARLY POSTNATAL LIFE

To study the changes of the synapses during early postnatal life of rats hippocampus CA1, and analyze the plasticity of the synapses in development processes, the numerical densities of perforated, non perforated and all synapses were determined and the percentage of perforated synapse were calculated by using successive electronic microscopy and sections with a new stereological technique Disector method. All items increased with aging from 0 to 30 postnatal days. These data indicate that there is a postnatal developmental periold in synapses of the hippocampus CA1 and also support the hypothesis that perforated and non perforated synapses constitute separate synaptic populations from early development.