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 animal's body. There are two or three germ layers: an outer layer (see ectoderm), an inner layer (see endoderm), and in most animal groups a middle layer (see mesoderm). See also development.
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Animalia , The kingdom Animalia, or Metazoa, includes all animals. Animals are multicellular, eukaryotic organisms, which are heterotrophic, meaning they obtain… 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… Animal , Animal Animals are creatures in the kingdom Animalia, one of the five major divisions of organisms. They are multicelled, eukaryotic (pronounced yook… Metazoan , In the tenth edition of his book Systema Naturae (1758), Swedish botanist Carolus Linnaeus developed a biological classification system (now known as… Gastrulation , gastrulation In the embryogenesis of a vertebrate, the next stage after the blastula, in which the three germ layers differentiate to form the triplo… Ectoderm , Skip to main content ectoderm ectoderm, layer of cells that covers the surface of an animal embryo after the process of gastrulation has occurred. Th…
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