Анотація:
The development of the heart connective-tissue structures of epimyocardiac origin is determined by development of the epicardiac coat systems of heart blood supply and connective-tissue stroma of the myocardium. In the process of antenatal development three methods are manifested for supplying blood to growing myoblasts: blood circulation by tissue slits, sinusoid system and vessels of the definitive coronary system. These systems gradually replace each other.