the bundle of his is an important part of the electrical conduction system of the heart, as it transmits impulses from the atrioventricular node, located at the anterior-inferior end of the interatrial septum, to the ventricles of the heart. the bundle of his branches into the left and the right bundle branches, which run along the interventricular septum. the left bundle branch further divides into the left anterior and the left posterior fascicles. these bundles and fascicles give rise to thin filaments known as purkinje fibers. these fibers distribute the impulse to the ventricular muscle. the ventricular conduction system comprises the bundle branches and the purkinje networks. it takes about 0.03–0.04 seconds for the impulse to travel from the bundle of his to the ventricular muscle.