The
atrioventricular (AV) node is a part of the
electrical conduction system of the heart that coordinates the top of the
heart. It electrically connects atrial and ventricular chambers. The AV node is an area of specialized
tissue between the
atria and the
ventricles of the
heart, specifically in the posteroinferior region of the
interatrial septum near the opening of the
coronary sinus, which conducts the normal electrical impulse from the atria to the ventricles. The AV node is quite compact (~1 x 3 x 5 mm). It is located at the center of
koch's triangle—a triangle enclosed by the septal leaflet of the tricuspid valve, the coronary sinus, and the membraneous part of the interatrial septum.