Atrioventricular (AV) Node
AV node is a part of electrical control system of the heart. It helps in coordinating the heart rate. The location is between the atria and the ventricles, in the interatrial septum of heart near the opening of coronary sinus. The location is at the center of Koch's Triangle which consists of the tricuspid valve, coronary sinus, and the interatrial septum.