Clear Rendering of the Inferior Interventricular Artery

Description

Shown on the diaphragmatic (inferior) surface of the heart, the inferior interventricular artery (posterior descending artery) courses in the posterior interventricular sulcus toward the apex, running between the right and left ventricles. Proximally it arises near the crux cordis, where it lies inferior to the atrioventricular groove and near the coronary sinus and accompanying venous tributaries. Superiorly, the ascending aorta and proximal great vessels frame the base of the heart, while epicardial fat and the visceral pericardium (epicardium) define the surface plane that the coronary vessels follow. That posterior course is a key teaching point for coronary dominance: in a right-dominant circulation the inferior interventricular artery usually branches from the right coronary artery, whereas in left dominance it often comes from the circumflex branch of the left coronary artery. It supplies the inferior third of the interventricular septum and adjacent ventricular myocardium, territory that correlates with inferior STEMI patterns and, when septal perforators are involved, conduction system ischemia affecting the atrioventricular node or bundle branches. A practical landmark. Interventionalists and surgeons reference this vessel when describing lesions at the crux, planning bypass graft targets, or orienting the heart during posterior exposure. Use this rendering for coronary artery anatomy modules in gross anatomy and cardiology courses, for labeling figures in interventional cardiology and cardiothoracic surgery texts, or for patient-facing education that needs a clear external view of epicardial vessels without chamber dissection. Anatomical accuracy verified by SciePro's Medical Advisory Board.