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. 2011 Sep 30;4(3):375. doi: 10.4022/jafib.375

Figure 4. Courses of the right sinus nodal artery.

Figure 4

A) sinus nodal artery does not reach the anterior inter atrial groove, B) sinus nodal artery reaches the anterior inter atrial groove but not beyond, C) sinus nodal artery crosses the anterior inter atrial groove, D) left sinus nodal artery crosses the anterior inter atrial groove. 1. Superior vena cava, 2. Anterior interatrial groove, 3. Aortic sinus, 4. Right coronary artery, 5. Appendage of the right atrium, 6. Right sinus nodal artery, 7. Left sinus nodal artery, 8 Left circumflex artery. (Concept adapted from Sow M L et al. The artery of the sinuatrial node: anatomic considerations based on 45 injection-dissections of the heart. Surg Radiol Anat 1996;18:103-9 with permission of Springer Science+Business Media)