#embryonic_tissue__embryonictissue  tissue in an embryo
  supertype:  animal_tissue  the tissue in the bodies of animals
  subtype:  germ_layer  (embryology) any of the 3 layers of cells differentiated in embryos following gastrulation
     subtype:  ectoderm__exoderm  the outer germ layer that develops into skin and nervous tissue
        subtype:  neural_tube  a tube of ectodermal tissue in the embryo from which the brain and spinal cord develop
     subtype:  mesoderm__mesoblast  the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue
        subtype:  chordamesoderm__chordomesoderm  the area of mesoderm that forms the notochord
        subtype:  mesenchyme  mesodermal tissue that forms connective tissue and blood and smooth muscles
     subtype:  endoderm__entoderm__endoblast__entoblast__hypoblast  the inner germ layer that develops into the lining of the digestive and respiratory systems

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