atrioventricular node n.
A small mass of specialized cardiac muscle fibers, located near the ostium of the coronary sinus and giving rise to the atrioventricular bundle of the conduction system of the heart. Also called A-V node.
|atrioventricular node (ā'trē-ō-věn-trĭk'yə-lər) Pronunciation Key
A small area of specialized cardiac muscle cells that conducts impulses from the sinoatrial node to the ventricles and initiates the contraction of the ventricles. It is located in the right atrium.