Lateral wall of left ventricle

The lateral wall of the left ventricle (LV free wall) refers to the myocardial region situated on the outer aspect of the left ventricle, anatomically opposite the interventricular septum. This wall is perfused primarily by the left circumflex coronary artery.

The walls of the left ventricle are classically described as the anterior (or superior), posterior (or inferior), lateral, and septal (interventricular septum) walls. This nomenclature is widely used in cardiac imaging, including echocardiography, cardiac MRI, and nuclear medicine, and is reflected in the American Heart Association's 17-segment model for left ventricular analysis. The anterior wall is sometimes referred to as the superior wall for anatomical accuracy, while the posterior wall may be called the inferior wall. The lateral wall is positioned on the left side of the ventricle, and the septal wall is adjacent to the interventricular septum.