#epithelium__epithelial_tissue  membranous tissue covering internal organs and other internal surfaces of the body
  supertype:  #animal_tissue  the tissue in the bodies of animals
  part:  #epithelial_cell
  subtype:  #endothelium  an epithelium of mesoblastic origin; a thin layer of flattened cells that lines the inside of some body cavities
  subtype:  #mesothelium  epithelium originating in the embryonic mesoderm; lines the primordial body cavity
  subtype:  #neuroepithelium  epithelium associated with special sense organs and containing sensory nerve endings
  subtype:  #decidua  the epithelial tissue of the endometrium

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