[The morphological and age-related prerequisites for distinguishing the structural-functional myocardial units, the "myocardioangion" and the "myocardiohistion"].

By means of complex of morphological methods, including scanning electron microscopy of native and corrosive electron preparations it was established that since 2-4 years of age fascicles containing 80-140 anastomosing bands of cardiomyocytes, separated with connective tissue layers appear in human ventricles myocardium. Shape, geometry and parameters of hemo- and lymphomicrocirculatory bed comply to these structures. Nerve fibers were present in interfascicular gaps. As fascicles and their components described meet the criterion for structural-functional unit of the organ, they can be considered as "myocardioangions". "Myocardiohistions", including muscular fibre, hemocapillary and connective tissue elements (collagen, reticuline and elastic fibres and fibroblasts) were demonstrated on the cellular level.