Atrioventricular node
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The atrioventricular node (abbreviated AV node) is the tissue between the atria and the ventricles of the heart, which conducts the normal electrical impulse from the atria to the ventricles.
The AV node receives two inputs from the atria: posteriorly via the crista terminalis, and anteriorly via the interatrial septum.1
An important property that is unique to the AV node is decremental conduction. This is the property of the AV node that prevents rapid conduction to the ventricle in cases of rapid atrial rhythms, such as atrial fibrillation or atrial flutter.
The blood supply of the AV node is from a branch of the right coronary artery in 85 to 90 percent of individuals, and from a branch of the left circumflex artery in 10 to 15 percent of individuals.
In certain types of supraventricular tachycardia a person could have two AV Nodes, this will cause a loop in electrical current and uncontrollably rapid heart beat. When this electricity catches up with itself, it will dissapate and return to your normal heart beat speed.
Related topics
References
Note 1: ACC/AHA/ESC Guidelines for the Management of Patients with Atrial Fibrillation - Executive Summary (Full text (http://www.acc.org/clinical/guidelines/atrial_fib/exec_summ/exec_afindex.htm))
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Pericardium - Epicardium - Myocardium - Endocardium - Cardiac pacemaker - Sinoatrial node - Atrioventricular node - Bundle of His - Purkinje fibers - Heart valves |