right cardiac atrium Myocardium of atrium Myocardium of right atrium 83531 Myocardium of atrium which consists of the myocardium proper and the conducting system of the the right atrium that is continuous with the tunica media of superior and inferior vena cavae. fma:fma83531 Right atrial myocardium FMA:83531 AS Myocardium of right atrium myocardium