| 单词 | gastrula |
| 释义 | gastrula (once / 30700 pages) n WORD FAMILY gastrula: gastrulae, gastrulas, gastrulation USAGE EXAMPLESSuch hybrids typically die before they reach the gastrula stage, the point in embryonic development at which major cell differences first become obvious. Scientific American(Oct 09, 2012) Applied to a gastrula when the blastorope does not entirely up. Webster, Noah, Webster's Unabridged Dictionary(2012) In a Morula the smaller cells, which contain less yolk-material, gradually grow around the larger yolk-containing cells to form the Gastrula. ?Malley, Austin, Essays In Pastoral Medicine(2012) n double-walled stage of the embryo resulting from invagination of the blastula; the outer layer of cells is the ectoderm and the inner layer differentiates into the mesoderm and endoderm Hyper conceptus, embryo, fertilized egg an animal organism in the early stages of growth and differentiation that in higher forms merge into fetal stages but in lower forms terminate in commencement of larval life |
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