Atrioventricular Node

**Definition:** A small nodular mass of specialized muscle fibers located in the interatrial septum near the opening of the coronary sinus. It gives rise to the atrioventricular bundle of the conduction system of the heart.

**Tree numbers:** - A07.541.409.147

**Synonyms:** - A-V Node - Atrio-Ventricular Node - AV Node