[Certain structural details of developing in vitro human embryonal brain explants studied with the aid of fluorescence and scanning electron microscopy].

The bundles growing away from the explants were mainly formed by neuroblast processes. It has been shown that the degree of differentiation of neuroblasts depends on "the age" of embryonal brain. The bundles of neuroblasts are accompained by slightly differentiated cells, having their own processes descending to the surface of the lining. These processes attached to the surface of a bundle cover and have no connection with the inner structures of the bundle. The use of a scanning electron microscopy allows to detect some new details of the behaviour of nerve cells in vitro.