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Peculiar pattern of interkinetic nuclear migration in the newt Notophtalmus viridescens

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Summary

The distribution of mitotic figures was studied in the neuroepithelium of Notophtalmus viridescens embryos of stages 14, 16 and 18. On the average, 34% of the mitotic figures were counted near the neurocoele (here in described as zone 1), 10% were recorded in the outer portion of the epithelium (zone 3) and 56% were found between these two regions (zone 2). It is concluded that this neuroepithelium is the site of interkinetic nuclear migration although its pattern is peculiar when compared to what occurs in the chick embryo. Also, the analysis of one micron-thick serial sections showed that the neuroepithelium in Notophtalmus viridescens is pseudo-stratified throughout neurulation.

Resumé

On a étudié la distribution des figures mitotiques dans le neuroépithélium d'embryons de Notophtalmus viridescens arrivés aux stades 14, 16 et 18. En moyenne, 34% des figures mitotiques apparaissaient près du neurocoele (ici décrite comme zone 1), 10% occupaient la zone externe de l'épithélium (zone 3) et 56% se trouvaient entre ces deux régions (zone 2). Il en est conclu que ce neuroépithélium est le site d'une migration nucléaire intercinétique qui est cependant d'un type particulier lorsqu'on la compare à ce qui s'observe chez l'embryon de poulet. De plus, l'étude de coupes sériées d'un micron d'épaisseur a permis de montrer que chez Notophtalmus viridescens, le neuroépithélium est pseudostratifié pendant toute la durée de la neurulation.

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Authors and Affiliations

  1. Département d'Anatomie, Faculté de Médecine, Université de Montréal, Succ.A, C.P. 6128, H3C 3J7, Montréal, P.Q., Canada

    C. Séguin & Paul-Emil Messier

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  1. C. Séguin
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  2. Paul-Emil Messier
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Séguin, C., Messier, PE. Peculiar pattern of interkinetic nuclear migration in the newt Notophtalmus viridescens . Anat Embryol 155, 47–56 (1979). https://doi.org/10.1007/BF00315730

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  • DOI: https://doi.org/10.1007/BF00315730

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