<prompt> SA node is supplied byRight coronary arteryLADLCXRAD  <response>: Ans. a Right coronary artery. Ref. Harrisons Medicine, 18th edChapter 230.SA NODE SA node lies at the junction of right atrium and SVC. It measures 15 mm x 2-3 mm in size. It is supplied by sinus node artery, which arises from right coronary 60 or left circumflex coronary artery 40.AV node AV node lies at the bases of inter-atrial septum just above the tricuspid annulus and anterior to coronary sinus. It is supplied by posterior descending coronary artery 90.Bundle of His Has dual blood supply AV nodal artery branches of anterior descending coronary artery. 