| 单词 | head fold |
| 释义 | > as lemmashead fold head fold n. Embryology a fold under the cephalic end of the blastoderm in an early amniote embryo, from which the anterior part of the body develops. 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 1873 Q. Jrnl. Microsc. Sci. 13 275 The cells, again, are very small at the head fold, but are very much larger in front of this. 1951 G. R. de Beer Vertebr. Zool. (ed. 2) xiii. 176 Eventually this area vasculosa spreads over most of the blastoderm up to the germ-wall, except for a region immediately in front of the head-fold which is known as the proamnion. 2005 R. Bellairs & M. Osmond Atlas Chick Devel. (ed. 2) xii. 111/2 With the formation of the head fold and head it becomes shifted. < as lemmas |
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