bearer of has characteristic multinucleate cell trophoblast cell syncytiotrophoblast cell A cell from the outer syncytial layer of the trophoblast of an early mammalian embryo, directly associated with the maternal blood supply. It secretes hCG in order to maintain progesterone secretion and sustain a pregnancy. syntrophoblast FMA:83043 plasmidotrophoblast syncytial trophoblast placental villous trophoblast Homo sapiens multinucleate