Edited sentence: Its deep aspect abuts cardiac myocytes belonging to the right atrium.Its superficial aspect is covered by adipose tissue.The SA node fibres vaguely resemble cardiac myocytes; however, they are thinner, squiggly and stain less intensely (on H&E) than cardiac myocytes.The sinoatrial node is submyocardial at the lateral aspect of the junction of the superior vena cava and right atrium