Gastrulation


Gastrulation is the process that orginates the gern layers ( ectoderm,  mesoderm and endoderm.) While this process happens the embrionic disc, enitially bilaminar, is coverted into a trilaminar embrionic disc.
During gastrulation the cells move into the embryo and the regions of the endoderm and mesoderm which are originally adjacent to the cell plate, they assume theirs apropiate positions in the ambryo. 


Reference-WOLPERT.  L . Princípios de Biologia do desenvolvimento . Porto alegre , 2000. Pag- 484  

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