gastrulation In the embryogenesis of a vertebrate, the next stage after the blastula, in which the three germ layers differentiate to form the triploblastic embryo and the basic body plan of the vertebrate is laid down. During this stage there is a complicated movement of cells from various positions in the blastula to form the germ layers in an approximation of their final positions. This process usually occurs at the end of the cleavage period.
gastrula (gas-troo-lă) n. an early stage in the development of many animal embryos. The gastrula consists of a double-layered ball of cells formed by invagination and movement of cells in the preceding single-layered stage (blastula) in the process of gastrulation.
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Blastula , blastula The stage of development of an animal embryo that results from cleavage of a fertilized egg. This stage generally resembles a hollow ball wi… Germ Layers , germ layers (primary germ layers) The layers of cells in an animal embryo at the gastrula stage, from which are derived the various organs of the ani… Stage , Stage (or Phase) The term "stage" is used to designate a developmental phase that, for Freud, is characterized by a specific organization of the libi… Metamorphosis , Metamorphosis, or a change in form, in biology means the transition from a larval stage to an adult stage. In most animals, embryonic development lea… Endoderm , Skip to main content endoderm endoderm (ĕn´dədûrm´), in biology, inner layer of tissue formed in the gastrula stage of the developing embryo. At the… Embryonic Development , All embryonic structures are derived from a single cell formed by the union of two gametes. Every individual organism began as a single cell, which d…
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