[Participation of the myocardium in the formation of the pulmonary vein wall of small mammals (a quantitative study)].

The thickness of the layer of cardiac muscle cells in the wall of the pulmonary veins was studied and quantitatively evaluated. The thickness of the intrapulmonary myocardial layer in the tunica adventitia of the venous wall depends on the body mass of the animal. This relation can be expressed by a hyperbola.