[Placenta in multiple pregnancy].

One hundred and thirty-one structurally different placentas during multifoetal pregnancy have been studied by the morphohistochemical and morphological methods. A high degree of conservation of placenta tissue structures of twins is observed in clinically normal pregnancy; the disorganisation is very mild, and the whole tissue, especially the margin, is actively included in the compensatory-adaptive processes. During clinically complicated pregnancy combined with congenital defects of the foetus and placenta, reorganization of the functional morphology of the placenta of twins occurs, which has a dynamic character reflecting the degree of disorganization o the structural elements, and also the level of the development of compensatory-adaptive processes. The knowledge of these changes allows an evaluation with a high degree of significance of the functional ability of the twins placenta as an organ in which metabolic processes between mother and child take place.