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Early Formation of the Coelomo-Cardiovascular Complexin the Chick Blastoderm

机译:小鸡胚层腔腔-心血管复合体的早期形成

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摘要

Although it is known that small areas in the unincubated avian blastoderm undergo regulation under influence of the surrounding large Rauber's (Koller's) sickle-dependent anlage fields, this seems not to be true for these anlage fields themselves. Indeed, after removal of whole anlage fields or regions in the unincubated avian blastoderms, no restoration of a complete embryo occurs, suggesting predisposition (mosaicism). In the unincubated chicken blastoderm, in the absence of Rauber's (Koller's) sickle horn regions, the isolated median region (with included middle part of Rauber – Koller's sickle) is not able, after culture, to give rise to primary heart tubes. Our present study indicates that the earliest anlage field of the coelomo-cardiovascular system in the unincubated chicken blastoderm (giving rise to both the area vasculosae laterales and the area vasculosa caudalis) is localized in the upper layer between the definitive endoderm anlage field (in the concavity of Rauber – Koller's sickle) and the more rostral and lateral neighbouring sickle-shaped lateral plate anlage.
机译:尽管众所周知,未孵化的鸟类胚盘中的小区域会受到周围的大型劳伯(镰刀)镰刀依赖的耕地的影响,但对于这些耕地本身而言,似乎并不正确。确实,在去除未孵化的鸟类胚盘中的整个破损区域或区域后,没有发生完整胚胎的恢复,表明有易感性(马赛克主义)。在未孵化的鸡胚盘中,在没有劳伯氏镰刀角区域的情况下,孤立的中位区域(包括劳伯氏中部–科勒氏镰刀)在培养后无法产生原发性心脏导管。我们目前的研究表明,未孵化的鸡胚胚腔中最早的腔-心血管系统的anlage场(引起侧脉管区和尾脉区都升高)位于定形内胚层脉管场之间的上层。 Rauber – Koller的镰刀的凹形),以及与鸟嘴形和外侧相邻的镰刀形的侧板小块。

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