| 单词 | gastrula |
| 释义 | gastrula —gastrular, adj. /gas"troo leuh/, n. , pl. gastrulas, gastrulae /-lee'/. Embryol. 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. [1875-80; < NL; see GASTRO-, -ULE] |
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