缘提 marginal ridge
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缘提 marginal ridge 鱼类胚胎胚盘层的周缘即胚环部位呈堤状隆起,称为缘堤。从其一处朝向胚盘层的中央生出胚盾,而原肠是从胚盾中沿着缘堤下面产生。胚盾和缘堤下面的原肠分别称为中轴原肠(axial archenteron)和缘原肠(marginal archenteron)。同时在这两个部位产生的中胚层分别称为中轴中胚层(axial me-soderm)和缘中胚层(marginal mesoderm)。
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