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Analysis of the brain embryonic morphogenesis in hynobius keyserlingii

Analysis of the brain embryonic morphogenesis in hynobius keyserlingii

Ontogenez 18(6): 639-650

The morphogenesis of brain and systems of analyzers was studied in Hynobius keyserlingii (Urodela, Amphibia) from the neurula stage to the onset of active feeding of larvae. It was established by stage plastic reconstructions of the brain that the neural tube end forms first two vesicles, then four and, in the end of embryogenesis, five vesicles (bypassing the three-vesicle stage). Transient structures, neuromeres, are not related to the constant brain divisions, since they are formed later than the brain vesicles and are not involved in morphogenesis. It was demonstrated by vital staining the cells of different brain divisions with porcionic dyes that morphogenetic movements of cell layers are observed in early embryogenesis. The cell layers are displaced in the caudal and ventral directions to metencephalon and diencephalon, in the ventral-rostral direction to prosencephalon, and in the ventral-caudal direction to infundibulum. Analysis of the cell number and of the volume of white and grey matter at 14 successive stages has shown that the grey matter volume remains unchanged in embryogenesis, whereas the cell number increases five times. When the brain spahe is actively changed, the volume and cell number are practically unchanged, although the cells are quantiatively redistributed by the brain divisions. A dynamic model of brain morphogenesis is proposed in which embryonic movements are coupled with the local fields of their mechanical tensions.

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Accession: 004742898

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