Coronary Arteries, Gross Anatomy

Description

Positioned in a left anterior oblique orientation, the heart’s epicardial coronary circulation is traced over the ventricles and atrioventricular grooves. The left coronary artery arises from the left aortic sinus and quickly divides into the anterior interventricular branch (left anterior descending, LAD) descending toward the apex in the anterior interventricular sulcus and the circumflex artery coursing laterally within the left atrioventricular (coronary) sulcus toward the obtuse margin. Portions of the right coronary artery are visible as it runs in the right atrioventricular groove, with marginal branches turning inferiorly along the acute margin; accompanying cardiac veins appear in blue, tracking alongside the major arterial trunks. Epicardial fat pads and the relationship of these vessels to the left atrial appendage, pulmonary trunk, and ascending aorta are suggested by surface contours and vessel origins. Coronary topography in this projection maps directly to common ischemic patterns: LAD occlusion correlates with anterior wall and septal infarction, circumflex disease with lateral wall ischemia, and proximal right coronary lesions with inferior infarction and potential involvement of the atrioventricular nodal artery in right-dominant circulation. This angle also mirrors what operators recognize in coronary angiography and what surgeons see during exposure for coronary artery bypass grafting, where the LAD on the anterior interventricular sulcus is the routine target for a left internal thoracic artery graft. Landmarks matter. Use this asset in gross anatomy and cardiovascular modules to teach surface landmarks, in cardiology texts to correlate vessel territories with ECG and echo wall-motion findings, and in patient-facing surgical consent materials to explain CABG or stent placement without opening chambers. Anatomical accuracy verified by SciePro's Medical Advisory Board.