cytotrophoblast

noun
cy·​to·​tro·​pho·​blast | \ˌsīt-ə-ˈtrō-fə-ˌblast \

Medical Definition of cytotrophoblast 

: the inner cellular layer of the trophoblast of an embryonic placental mammal that gives rise to the plasmodial syncytiotrophoblast covering the placental villi

called also Langhans' layer, layer of Langhans

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