120 placentas were examined at chronic placental insufficiency which was accompanied by hypoxia of fetus and restriction of its development. It is set that changes in extraplacental membranes were presented dystrophic, necrobiotic processes in amniotic epithelium, cytotrophoblast and decidual cells. The collogen fibres of extraplacental membranes lose a fascicular structure, which makes them light and they lose a well-organized location. Changes in extraplacental membranes influence paraplacental metabolism disorder and increase the risk of fetus pathology.
