Right Auricle of the Heart, Anterior View

Description

Seen from an anterior sectional perspective, the right auricle (auricula dextra cordis) projects as a trabeculated, ear-like appendage from the anterosuperior aspect of the right atrium. Its free margin lies anterior to the right atrioventricular groove and overlaps the root of the ascending aorta and proximal pulmonary trunk, while its base blends medially into the atrial wall at the level of the sulcus terminalis. Pectinate muscles line the auricular lumen, contrasting with the smoother posterior atrial wall that remains more medial and posterior. Clinically, the right atrial appendage matters because it is a common site for thrombus formation in atrial fibrillation and atrial flutter, and its anatomy guides both echocardiographic assessment and interventional planning. Catheter ablation lines along the cavotricuspid isthmus and atriotomy or cannulation for cardiopulmonary bypass depend on reliable anterior landmarks, including the auricular margin and the adjacent great vessel roots. Small structure, real consequences. Use this illustration in gross anatomy and cardiothoracic surgery teaching to orient learners to the right atrial appendage in relation to the anterior surface of the heart, and in clinical education materials discussing right atrial thrombus, venous cannulation, and electrophysiology access routes. It also suits journal figures and textbook plates that need precise terminology for the atrial appendage (auricle) rather than the atrium proper. Anatomical accuracy verified by SciePro's Medical Advisory Board.