Inferior Ventricular Arteries of the Right Coronary Artery

Description

Arising from the right coronary artery in the right atrioventricular (coronary) sulcus, the inferior ventricular branches sweep onto the diaphragmatic surface of the right ventricle and course inferiorly toward the acute margin and apex. Smaller epicardial vessels arborize over the inferior myocardium, with accompanying cardiac veins in close proximity and often crossing at shallow angles on the surface. Superiorly, the ascending aorta crowns the base of the heart, while the pulmonary trunk and proximal pulmonary vessels sit anterior and leftward, framing the coronary origins without exposing intracardiac anatomy. Epicardial fat pads and pericardial surface contours help define the grooves that guide these vessels. This right-sided, inferior emphasis matters because the right coronary artery most often supplies the inferior wall via the posterior descending artery (inferior interventricular artery) and adjacent inferior ventricular branches, a pattern that determines the territory at risk in an inferior ST-elevation myocardial infarction. Right ventricular infarction is the clinical trap, often accompanying proximal RCA occlusion and altering hemodynamic management (preload dependence, caution with nitrates). Electrophysiology also enters the picture, since SA nodal and AV nodal branches commonly arise from the RCA, and ischemia in this distribution can present with bradyarrhythmias and varying degrees of AV block. Use this asset in gross anatomy or cardiovascular physiology teaching to clarify epicardial coronary trajectories on the diaphragmatic surface, where learners often lose orientation between the acute margin, apex, and posterior interventricular sulcus. It also fits cardiology slide decks on coronary dominance, cath lab orientation of the RCA, and textbook figures explaining why inferior MI can look “posterior” on the ECG depending on branch patterns. Anatomical accuracy verified by SciePro's Medical Advisory Board.