#conjunctiva  a transparent membrane covering the eyeball and under surface of the eyelid
  supertype:  #mucous_membrane__mucosa  mucus-secreting membrane lining all body cavities or passages that communicate with the exterior
  part of:  #eye  #eyelid
  subtype:  #pinguecula  a slightly elevated elastic tissue deposit in the conjunctiva that may extend to the cornea but does not cover it
  subtype:  #pterygium  a thickened triangular layer of conjunctiva extending from the nasal edge of the eye to the cornea; pterygia arise from irritation of the pinguecula

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