<unk> s are multinucleated cells found in the placenta of human embryos.
They are the outer syncytial layer of the trophoblasts and actively invade the uterine wall.
They form the outermost fetal component of the placenta (also known as 'syntrophoblast') and massively increase the surface area available for nutrient exchange between the mother and the fetus.
Cells from the<unk>  secrete human chorionic gonadotropin.
Syncytiotrophoblast
Trophoblast
Germ layer
Mesoderm
Adnexa
Epithelium
Ameloblast
Immunoblast