Term Name:	sinoatrial node
Synonyms:	cardiac pacemaker, Koch's node, node of Keith-Flack, nodus sinuatrialis, SA nodal muscle tissue, SA node, sinoatrial node, sinu-atrial node, sinuatrial nodal muscle tissue, sinuatrial node, sinus node, sinus node of Keith and Flack
Definition:	The part of the cardiac conduction system that controls the timing of heart muscle contraction. It relays electrical signals to the AV node[GO]. Subdivision of conducting system of heart at the junction of the right atrium and the superior vena cava, around the sinoatrial nodal branch of right coronary artery and is continuous with the internodal tract[FMA].
Ontology:	Cell Ontology [UBERON:0002351]