[The polarization of neuroepithelial cells when a portion of the neural plate is inserted into the neural tube cavity in amphibian embryos].

Portions of homologous neuroepithelium of various length were introduced into the neural tube cavity in Rana arvalis and Pleurodeles waltlii late neurula. The neural tube in R. arvalis was destroyed independently of the transplant length. In P. waltlii neural primordia were deformed if a large transplant prevented closing of the neural tube. Redundant increase in the host cells length (polarization) was observed during the small transplant-induced retardation of neurulation. Recipient cells elongated 1.5-2 fold as compared to the normal ones. Zones of contact polarization were detected. They arise in slowly relaxing layer under conditions during the transplant-induced retardation of neurulation. The labelled TRITC cells introduced into the neural tube cavity integrated into the wall of the neural tube and retarded polarization of its cells.