Early formation of the coelomo-cardiovascular complex in the chick blastoderm

Marc Callebaut; Emma Van Nueten; Guy Hubens; Fernand Harrison

doi:10.26496/bjz.2010.190

Authors

Marc Callebaut Laboratory of Human Anatomy and Embryology, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium
Emma Van Nueten Laboratory of Human Anatomy and Embryology, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium
Guy Hubens Laboratory of Human Anatomy and Embryology, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium
Fernand Harrison Laboratory of Human Anatomy and Embryology, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium

DOI:

https://doi.org/10.26496/bjz.2010.190

Keywords:

chick embryo, mosaic development, Rauber-Koller’s sickle, sickle horns, coelomo-cardiovascular system, coelomates

Abstract

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.

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