Anterior Interventricular Sulcus

Description

Running obliquely from the base toward the apex on the sternocostal surface, the anterior interventricular sulcus marks the external plane separating the right ventricle on the anteroinferior aspect from the left ventricle on the anterolateral aspect. Within this groove, the anterior interventricular artery (left anterior descending, LAD) typically descends alongside the great cardiac vein, both oriented inferiorly toward the apex, while the pulmonary trunk sits superior and leftward and the ascending aorta rises superior and rightward from the base. Surrounding thoracic landmarks frame the heart in situ, with anterior ribs and costal cartilages superficial to the pericardial silhouette and the thoracic vertebral column posterior. Clinically, this is the surface landmark most clinicians map to the LAD territory, the classic culprit in anterior wall and anteroseptal myocardial infarction, where occlusion threatens the anterior two thirds of the interventricular septum and can produce bundle branch block or ventricular arrhythmias. The sulcus also helps orient cardiothoracic approaches, since the LAD and great cardiac vein guide coronary bypass target selection and help define safe dissection planes when mobilizing the anterior surface of the heart beneath the pericardium. A practical groove. Easy to lose under epicardial fat. Use it in gross anatomy and cardiology teaching to link external cardiac topography to coronary perfusion territories, ECG lead localization, and cross sectional imaging orientation on CT or MRI. It also fits operative atlases and patient education materials explaining LAD stenting, CABG planning, and complications of anterior infarction in the context of the heart’s position relative to the rib cage and great vessels. Anatomical accuracy verified by SciePro's Medical Advisory Board.