[Spatial deployments of morphogenetic movements as elements of the oral field in anuran amphibians. I. Structurally stable morphogenetic movements].

The movements of cells in the oral field of anuran embryos were followed by means of orto- and heterotopic transplantations of the ectoderm fragments. To mark individual ectoderm regions, the embryos were used which differed from each other by colour. The cells polarize along the apical-basal layer axis and the polarization spreads along the layer as a waver embracing consecutively new and new cells. The waves of morphogenetic rearrangements from the spatial deploiments of morphogenetic movement, i. e. the transition between the local morphologies of the layer which replace one another in time is swept continuously in space. The presence of spatial sweep is the necessary condition for the structural stability of morphogenetic movements.