Figure 31=104g

Diagram showing arterial blood supply of the cardiac conduction system. The nodal artery (NA) arises from the posterior descending artery (PD). The bulk of the arterial blood supply to right and left bundle branches comes from the left anterior descending artery (LAD).

(From MJ Davies: Pathology of Conduction Tissue of the Heart. London, Butterworth, 1979.)