cytotrophoblast extravillous cytotrophoblast 2018-09-25T11:11:41Z BTO:0006206 BrendaTissueOBO Extravillous cytotrophoblast cells are the cells of the outermost layer of the fetal component of the human placenta. The extravillous cytotrophoblast cells located proximal to the villous stroma are proliferating cells. Marion extravillus cytotrophoblast