Sinoatrial Node: A section of nodal tissue that sets the rate of contraction for the heart.Purkinje Fibers: Fiber branches that extend from the atrioventricular bundle.Atrioventricular Node: A section of nodal tissue that delays and relays cardiac impulses.Atrioventricular Bundle: A bundle of fibers that carry cardiac impulses.Heart nodes and nerve fibers play an important role in causing the heart to contract. Endocardium: The inner layer of the heart.Ĭardiac conduction is the rate at which the heart conducts electrical impulses.Myocardium: The muscular middle layer of the wall of the heart.Epicardium: The outer layer of the wall of the heart.Ventricles: Lower two chambers of the heart.
Atria: Upper two chambers of the heart.
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