The atrioventricular bundle is a specialized component of the cardiac conduction system that provides the only normal electrical connection between the atria and the ventricles. It originates from the atrioventricular (AV) node and traverses the fibrous skeleton of the heart, passing along the membranous portion of the interventricular septum.[1] The fibrous skeleton consists of dense connective tissue that electrically insulates the atria from the ventricles while providing structural support for the heart’s valves and conduction pathways.[2]

After descending through the membranous interventricular septum, the atrioventricular bundle divides into two main branches. The right bundle branch conducts electrical impulses to the subendocardial conduction network of the right ventricle, while the left bundle branch distributes impulses to the subendocardial branches of the left ventricle.[1] Through this branching arrangement, the atrioventricular bundle ensures coordinated activation of the ventricular myocardium.