It also called formation of three germ layer .
Transformation of blastula or blastocyst into gastrula is called gastrulation .
During gastrulation the cells of the inner cell mass move to their final destination to form three germ layer ectoderm, mesoderm and endoderm .
The movement of inner cell of inner cell mass is called morphogenetic movement .
During gastrulation a cavity is formed known as archenteron with an opening called blastopore .
Each germ layers gives rise to specific tissue organs and organ systems .
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