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Use gastrula in a sentence. pl. -Â·laeÂ· or -Â·las. an embryo in an early stage of development, consisting of a sac with two layers, the ectoderm and endoderm, enclosing a central cavity, the archenteron, that opens to the outside through the blastopore. Origin of gastrula.
During the process of embryogenesis, blastula formation is followed by the gastrula, thus both represents a different stage of embryo formation. The blastula and gastrula are formed through different processes. The blastula is formed through blastulation, while the gastrula is formed through gastrulation. The blastula and gastrula are formed through different speeds of mitotic divisions. The blastula is formed through rapid mitotic divisions of the zygote, while slow mitotic divisions of the blastula results in the gastrula. In the process of blastula formation, the cells do not move. However, during the gastrula formation process, the cell masses move through morphogenetic movements. Unlike the blastula, there are three distinct germ layers that are present in the gastrula.