ectoblast
  外胚葉
  ec·to·blast /ˈɛktəˌblæst/ 名詞
  外質生成細胞,外胚層,外膜,外胚
  Ec·to·blast n.  Biol. (a) The outer layer of the blastoderm; the epiblast; the ectoderm. (b) The outer envelope of a cell; the cell wall.
  ◄ ►
  ectoblast
       n : the outer germ layer that develops into skin and nervous
           tissue [syn: ectoderm, exoderm]