chorion

Noun
  1. The outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals) (synset 101475580)
    referred to in: mammal, mammalian - any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk
    is a type of: sac - a structure resembling a bag in an animal
    has: chorionic villus - one of the tiny villi that stick out of the fetal chorion and combine with the mother's uterine tissue to form the placenta
    is a part of:
    • amniote - any member of the Amniota
    • fetal membrane - any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus

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