Further behind is the vertebral column.įollowing the direction of blood flow, the atrial chamber begins at the pulmonary veno-atrial junctions and terminates at the fibro-fatty tissue plane that marks the atrioventricular junction at the mitral orifice.
The tracheal bifurcation, the esophagus, and descending thoracic aorta are immediately behind the pericardium overlying the posterior wall of the left atrium. The transverse pericardial sinus lies anterior to the left atrium, and in front of the sinus is the root of the aorta. The pulmonary veins enter the posterior part of the left atrium with the left veins located more superior than the right veins. Owing to the obliquity of the plane of the atrial septum and the different levels of the orifices of the mitral and tricuspid valves, the left atrial chamber is more posteriorly and superiorly situated relative to the right atrial chamber. Viewed from the frontal aspect of the chest, the left atrium is the most posteriorly situated of the cardiac chambers. Customer Service and Ordering Information.About Circ: Arrhythmia and Electrophysiology.Stroke: Vascular and Interventional Neurology.Journal of the American Heart Association (JAHA).Circ: Cardiovascular Quality & Outcomes.Arteriosclerosis, Thrombosis, and Vascular Biology (ATVB).
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