Fine Morphological Study of Neural Tube Formation in the Teleost, <I>Oryzias latipes</I>

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  • Fine Morphological Study of Neural Tube Formation in the Teleost,Oryzias latipes
  • Fine Morphological Study of Neural Tube

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Abstract

Neurulation in the Teleost, Oryzias latipes, was characterized by the formation of a solid neural cord (keel) unlike that in other vertebrates. The cord cells then divided into right and left groups adjacent to the midline, and finally formed a pseudostratified epithelium on each side. In the midline, the primitive neurocoel first appeared in the ventral part, and then gradually dilated and extended dorsad. Around the time of appearance of the neurocoel, the following remarkable morphological changes were encountered in the neuroepithelial cells: marked elongation of each cell; a desmosomal connection between cell necks near the apical cell surface; irregular apical cytoplasmic projec tions into the neurocoel. It may indicate that these morphological changes play a role in the opening of the neurocoel.<BR>Neural crest cells were derived from th e ectoderm, and were, at first, intercalated in the space between the dorsal end of the developing neural cord and the epidermis in a wedge-like fashion, and then followed by gradual separation. These cells were irregular and somewhat amoeboid in shape, suggesting an active migration.<BR>Comparison of the process of neural tube fo r mation and of neural crest separation in teleosts with these processes in other vertebrates, suggested that there were little essential differences in the morphogenetic events involved.

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