cell communication involved in cardiac conduction SA node cell to atrial cardiac muscle cell communication SA node cardiomyocyte to atrial cardiomyocyte communication The process that mediates interactions between an SA node cardiomyocyte and its surroundings that contributes to the process of the SA node cardiomyocyte communicating with an atrial cardiomyocyte in cardiac conduction. Encompasses interactions such as signaling or attachment between one cell and another cell, between a cell and an extracellular matrix, or between a cell and any other aspect of its environment. biological_process SAN cardiomyocyte to atrial cardiomyocyte communication sinus node cardiomyocyte to atrial cardiomyocyte communication GO:0086070 2011-11-22T09:32:45Z sinoatrial node cardiomyocyte to atrial cardiomyocyte communication SA node cardiac muscle cell to atrial cardiac muscle cell communication