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| |Low magnification micrograph of a sinoatrial node (center-
right on image) and its surrounding tissue. The SA node
surrounds the (sinuatrial) nodal artery (on lumen in the image),
a branch of the right coronary artery, abuts cardiac myocytes
(of the right atrium) on its deep aspect (left of image) and
adipose tissue on its superficial (epicardial) aspect (right of
image). H&E stain.| |Isolated Heart conduction system, showing
SA node| The sinoatrial node (also commonly spelled sinuatrial
node, abbreviated SA node or SAN, also called the sinus node) is
the impulse-generating (pacemaker) tissue located in the right
atrium of the heart, and thus the generator of normal sinus
rhythm. It is a group of cells positioned on the wall of the
right atrium, near the entrance of the superior vena cava. These
cells are modified cardiac myocytes. Though they possess some
contractile filaments, they d