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cy·to·tro·pho·blast .sīt-ə-'trō-fə-.blast n 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
cy·to·tro·pho·blas·tic -.trō-fə-'blas-tik adj
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n.
the part of a trophoblast that retains its cellular structure and does not invade the maternal tissues. It forms the outer surface of the chorion.
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cy·to·tropho·blast (si″to-trofґo-blast) [cyto- + trophoblast] 1. the cellular (inner) layer of the trophoblast; called also Langhans layer. 2. cytotrophoblastic cell. cytotrophoblastic adjMedical dictionary. 2011.