- a small node of modified cardiac muscle fibers located near the ostium of the coronary sinus; it gives rise to the atrioventricular bundle of the conduction system of the heart;
- loosely circumscribed conduction tissue with sparse pacemakerlike (P) cells in the atrioventricular junction.
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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.