ON THE POLYINVAGINATION IN EMBRYO OF A TELEOST, THE MEDAKA, <i>ORYZIAS LATIPES</i>

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  • GAMO Hideo
    Department of Biology, Aichi Gakugei University

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  • メダカ胚の重複陥入について
  • メダカハイ ノ チョウフクカンニュウ ニ ツイテ エイブン

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Abstract

Many figures of the polyinvagination are observed all over the blastodisc in early gastrulae of a teleost, the medaka, Oryzias latipes. This is different from the neural crest formation in early neurula which is universal in teleost. The author considers that the teleost also has a possibility of two kinds of course for blastodisc cells to migrate into the blastocoel at the blastula stage, that is, the ordinary invagination through the blastopore and the polyinvagination. Besides he assumes that the neural crest formation in the neurula stage is a partial descendant of the general polyinvagination in the gastrula stage.

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