| 单词 | germ layer |
| 释义 | > as lemmasgerm 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. ΘΚΠ 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. < as lemmas |
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