Germ layers development video


The embryo initially forms two germ layers- the ectoderm and the endoderm. This embryo is therefore called the bilaminar embryo. Later a third germ layer is added, called the mesoderm. The process for the adding of the 3rd germ layer is gastrulation. This process leads to the formation of the organization of the embryo so that the embryo now has folds. It is organizable to head, tail or  limb buds. The primitive streak helps in the formation of this third germ layer. Cells that are coming from the ectoderm insinuate themselves between the ectoderm and the endoderm around the primitive streak. They migrate rapidly around the whole of the embryo and assist the process of organization forming the mesoderm.


Germ layers [[interactive video text]


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