Right Coronary Leaflet of the Aortic Valve on the Left Side of the Heart Presented from a Lateral Standpoint

Description

Oriented to the left side of the heart in a lateral section, the right coronary leaflet (right coronary cusp) of the aortic valve forms one of the three semilunar valvulae semilunares at the left ventricular outflow tract. Its free margin faces centrally toward the aortic lumen, where the nodulus of Arantius sits at the midpoint of the closing edge, flanked by thin lunulae that complete coaptation with the noncoronary and left coronary leaflets. Superior to the leaflet lies the aortic root and sinus of Valsalva for the right coronary cusp, while inferiorly the cusp attaches to the fibrous annulus at the ventriculoaortic junction. Commissures at the lateral extents mark the transition to the adjacent cusps. This lateral standpoint highlights what fails when regurgitation occurs: the leaflet must meet its partners along the coaptation line, and the nodulus and lunulae help seal the central gap during diastole. Small anatomic irregularities here matter. Degenerative calcific aortic valve disease often begins at the cusp bases and commissures, and bicuspid valve fusion alters commissural position and cusp geometry, shifting stress onto the free margin and predisposing to eccentric aortic regurgitation or early stenosis. Use this plate for teaching the semilunar valve mechanism in gross anatomy and cardiovascular physiology, or for cardiology and cardiac surgery texts that discuss cusp coaptation, commissurotomy landmarks, and the anatomy relevant to surgical aortic valve repair and transcatheter valve sizing. It also pairs well with echo and CT modules when correlating aortic cusp naming (right coronary, left coronary, noncoronary) to the coronary ostia and aortic sinuses. Anatomical accuracy verified by SciePro's Medical Advisory Board.