#fetal_membrane__fetalmembrane  any membrane that functions for the protection or nourishment of respiration or excretion of a developing fetus
  supertype:  #tissue_layer__membrane  a pliable sheet of tissue that covers or lines or connects organs or cells of animals
  part:  #amnion  #chorion
  subtype:  #allantois__allantoi  vascular fetal membrane that develops from the hindgut in embryonic higher vertebrates (mammals; birds; reptiles)
  subtype:  #caul__veil__embryonic_membrane__embryonicmembrane  the inner embryonic membrane of higher vertebrates (especially when covering the head at birth)
  subtype:  #umbilical_cord__umbilicalcord  membranous duct connecting the fetus with the placenta

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