Cardiac conduction Picture and Definition

Cardiac tissue where the heart beat originates and spreads to reach all parts of the myocardium. The structures that make up the conduction system are the sinoatrial node, the internodal atrial pathways, the atrioventricular node, the bundle of His and its branches, and the Purkinje system. The various parts of the conduction system and, under abnormal conditions, parts of the myocardium, are capable of spontaneous discharge