Epiboly : The outward movement of blastomeres which cover the embryo and form presumptive ectoderm. It is the morphogenetic movement (shifting) of blastomeres to form three germinal (Primary) layers ectoderm, mesoderm and endoderm with following features :ĭifferentiation of cells for future morphogenesis.Ĭharacteristic and the pattern of movement vary in different species.įormation of blastopore marks the beginning.įormation of archenteron and closure of blastopore mark the end of gastrulation.Ĭellular movement are primarily of two types :
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