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单词 germ layer
释义

> as lemmas

germ layer
germ layer n. Embryology any of the layers of cells into which the blastoderm divides (ectoderm, endoderm, and mesoderm); (in early use also) †the blastoderm itself (obsolete); cf. earlier germinal layer n. at germinal adj. Compounds.
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the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > embryo parts > [noun] > membrane and layers of cells
germinal layer1836
cell layer1843
mucous layer1846
germ layer1855
mesoblast1857
blastoderm1859
head fold1873
mesoderm1873
epiblast1875
hypoblast1875
splanchnopleure1875
mesenchyme1881
acroblast1884
mesothelium1886
epimere1890
mesectoderm1894
mesendoderm1894
cœloblast1895
placode1907
shield1913
mesentoderm1921
meristoderm1945
bilayer1962
1855 R. Owen Lect. Compar. Anat. Invertebr. Animals (ed. 2) xii. 260 When the yolk has undergone its subdivision, and its peripheral stratum has been metamorphosed into the primitive germ-layer, a large clear space or cell appears in the centre.
1879 tr. E. Haeckel Evol. Man I. 13 For example, the sexual organs of the human embryo..appear to originate from the middle germ-layer.
1932 M. T. Harman Textbk. Embryol. xviii. 314 The germ layer or germ layers from which the blood and the blood system arise has been variously given. By some authors it has been assigned to a definite germ layer of its own, the angioblast.
2002 S. J. Gould Struct. Evolutionary Theory x. 1150 Their maximally simplified development even proceeds without gastrulation or the differentiation of germ layers.
extracted from germn.
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as lemmas
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