[The mitotic division of cardiac muscle cells]

A damage of the myocardium inflicted in the early post-natal period of the development of a rat, i. e. when there exists a high mitotic activity of the muscle cells of the heart, did not heal at the expense of filling of the focus of damage by newly formed muscular cells. The myocardium of the auricles in adult animals does not possess any special capabilities for proliferation of muscular elements by means of mitosis, as compared with the myocardium of the ventricles.