[Polarization microscopic studies of the fine structure of the maternal-fetal barrier in normal human placentas depending on gestational age].

The submicroscopic structure of the throphoblast basement membrane and the collagen in the chorionic villi of human placentas was investigated by polarization microscopic technique. The study establishes a quantitatively measurable difference in the submicroscopic range of the placental membrane in relation to histologically classified disturbances of maturity.