gastrula 的定义
plural gas·tru·las, gas·tru·lae [gas-troo-lee]. /ˈgæs trʊˌli/. Embryology.
- a metazoan embryo in an early state of germ layer formation following the blastula stage, consisting of a cuplike body of two layers of cells, the ectoderm and endoderm, enclosing a central cavity, or archenteron, that opens to the outside by the blastopore: in most animals progressing to the formation of a third cell layer, the mesoderm.
更多gastrula例句
- A view of the gastrula stage after the larva has become fixed is given in fig. 2.
- At the same time they become clearer and permit a view of the interior of the gastrula.
- This gastrula is the simplest form of the "person," and the two germinal layers are its sole organs.
- In the further development of the various tissue-forming animals from the gastrula we have to distinguish two principal groups.
- The two-layered young stage of higher creatures, when it has a free-swimming existence, is called a Gastrula (Fig. 6).