[Nucleolar apparatus of proliferating and differentiating cells of human embryonic neocortex during formation of the cortical plate].

Human neocortex was studied using light and electron microscopy in embryos 6-10 wks of development. Vast majority of proliferating cells was established to be concentrated in ventricular zone. Nuclear, nucleolar and cytoplasmic organelle structure indicate various level of synthetic processes activity in cells of different layers of the developing human neocortex. The dynamics in nucleolar number in the cells of ventricular zone and cortical plate was demonstrated.