[Embryogenesis of atrioventricular valve anomalies]

Formation of the atrioventricular valves under normal conditions is brought about after the completion of septation and envisages a sequential completion of atrioventricular fissure invagination, myocardium delamination and demuscularization of the folds. Anomalies of the atrioventricular valves are formed if the septation process or general principles of the valve formation are disturbed or if there is a combination of these factors. Specificity of the valve disturbances are determined by the causative factor.