[Vascularization of the sino-atrial and atrioventricular nodes].

A recent personal study of the coronary arteries has enabled us to give precise details of the blood supply of the nodal structures. The right coronary artery is the commonest source (supplying 67% of the sino-atrial nodes, 85% of the atrio-ventricular nodes, and both nodes simultaneously in 60%). During the course of this study we have also demonstrated that the sino-atrial node may have a double vascular supply. It seems likely that the blood supply to the atrio-ventricular node is complex; because of the limitations of our study method, we examined only the main source of supply.