mesoblast
  中胚葉
  me·so·blast /ˈmɛzəˌblæst, ˈmɪz, ˈmɪs, ˈmɛs-/ 名詞
  中胚層
  Mes·o·blast n.  Biol. (a) The mesoderm. (b) The cell nucleus; mesoplast.
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  mesoblast
       n : the middle germ layer that develops into muscle and bone and
           cartilage and blood and connective tissue [syn: mesoderm]