[Immunohistochemical studies of the nature of connective tissue in fetal membranes].

Fetal membranes at the end of pregnancy have been examined indirectly with the help of FITC labelled antibodies for the occurrence of different collagen types (I, II, III, IV) and their initial steps as well as fibronectin and laminin. The connective tissue of amnion and chorion is composed of collagen type I and p-III. Collagen type IV occurs only rarely. Despite of the borderline reticulin fibres are not the component of these mechanical resistant fibre-mats. In the PAS positive material, seen between the cells of the trophoblast, laminin and type IV collagen were found. It can be stated that the compound of the intercellular substance is of the same kind as the basement membrane.