Metablastic: relating to the ecto- or meta-blast or ectoderm.
Ectoblast: the outer wall of a cell; the ectoderm or epiblast.
The outer is the Ectoderm and the inner is the Endoderm or Hypoblast.
The ectoderm retains its ciliation only in the sensory organs.
It consists of three layers: ectoderm, endoderm, and mesoderm.
Ectoderm, the tissue in an adult derived from the ...