atrioventricular (AV) node

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a·tri·o·ven·tric·u·lar (AV) node

(ā'trē-ō-ven-trik'yū-lăr nōd) [TA]
A small node of modified cardiac muscle fibers located near the ostium of the coronary sinus; it gives rise to the AV bundle of the conduction system of the heart.
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