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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.
Gastrulation is a phase early in the embryonic development of most animals, during which the single-layered blastula is reorganized into a trilaminar (three-layered) structure known as the gastrula. These three germ layers are known as the ectoderm, mesoderm, and endoderm.ollowing gastrulation, cells in the body are either organized into sheets of connected cells (as in epithelia), or as a mesh of isolated cells, such as mesenchyme.