Abstract
The ultrastructure of changes in synapses after injury in newborn rats were studied. The ethanol-phosphotungstic acid method of staining proved to be most useful for this purpose. The two characteristic findings were obtained from the qualitative and quantitative investigations: (1) the formation of synaptic junctions may develop according to circumstances; (2) the possibility that ouabainsensitive and K+_dependent p-nitrophenylphosphatase of the Na^+-K^+-ATPase complex is closely related to plasticity of the synapse may be proposed.
