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Bachmann's bundle
In the heart's conduction system, Bachmann's bundle (also called the Bachmann bundle or the interatrial tract) is a branch of the anterior internodal tract that resides on the inner wall of the left atrium. It is a broad band of cardiac muscle that passes from the right atrium, between the superior vena cava and the ascending aorta. Bachmann's bundle is, during normal sinus rhythm, the preferential path for electrical activation of the left atrium. It is therefore considered to be part of the "atrial conduction system" of the heart.
==Structure==
The Bachman's bundle receives its blood supply from the sinoatrial nodal artery (right, left or both).
Besides Bachmann's bundle, the other three conduction tracts that constitute the ''atrial conduction system'' are known as the anterior, middle, and posterior tracts, which run from the sinoatrial node to the atrioventricular node, converging in the region near the coronary sinus. ''Atrial automaticity foci'' are within the atrial conduction system. The concentration of converging conduction tracts near the coronary sinus results in considerable automaticity activity originating in that area.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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