It initiates the sinus rhythm, or normal electrical pattern followed by contraction of the heart. This impulse spreads from its initiation in the SA node throughout the atria through specialized internodal pathways, to the atrial <u>myocardial contractile</u><span> cells and the atrioventricular node.</span>
Bundle of His is an intracardiac formation that is part of the electrical system of the heart. It is a cord that has its beginning in the atrioventricular node and goes through the interatrial septum and interventricular septum. Bundle of His regulates the cardiac impulse through the potential difference between two nodules. The first nodule is in the superior vena cava. The second nodule is the atrioventricular nodule
