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Proliferative response of the mesencephalic matrix areas in the reparation of the optic tectum of Triturus cristatus carnifex.

The localization and proliferative response of optic tectum matrix cells has been studied in adult newt following an experimental lesion on an optic lobe. The results show that 15 days after the lesion the cells in division, autoradiographically labelled, are located in the periventricular layer. Thirty days after the lesion the labelled cells are also found in the innermost grey layers; at 90 days the injured optic tectum regains the cytoarchitecture characteristic of this centre, with labelled cells, whether in the external or in the internal pyriform layers. In all the stages the labelled cells are also found in the periventricular layers of the controlateral optic tectum, in the dorsal pallium and in the striatum. The quantitative data exhibit the existence of a direct relationship between the number of proliferating cells in the injured optic lobe and the extent of the lesion. These data show the possibility of active cellular proliferation for the reconstruction of the lesioned nervous area and for restoration of the characteristic histological structure.