#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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