Aortic Annulus and Root

The aortic root is a complex anatomical structure that serves as the transition between the left ventricular outflow tract and the ascending aorta, housing the aortic valve apparatus (StatPearls, NBK538461). It consists of the aortic annulus, the sinuses of Valsalva, the interleaflet triangles, and the sinotubular junction. The aortic annulus is a functional, rather than purely histological, fibrous ring that provides the structural support and attachment points for the three semilunar leaflets of the aortic valve (Journal of Anatomy, 2000). This region is critical for maintaining hemodynamic efficiency and ensuring the proper opening and closing of the valve during the cardiac cycle. Pathological enlargement of the aortic root is a hallmark of connective tissue disorders such as Marfan syndrome and Loeys-Dietz syndrome, which significantly increases the risk of life-threatening aortic dissection (Circulation, 2010). While the aortic root is a primary target for surgical interventions and transcatheter aortic valve replacement (TAVR), it does not function as a molecular receptor or enzyme for direct drug binding. Pharmacological treatments, such as beta-blockers or angiotensin receptor blockers, are often employed to reduce the rate of root dilation by modulating systemic blood pressure and signaling pathways like TGF-beta, rather than by interacting with the root as a primary molecular target (New England Journal of Medicine, 2014).

Other names

Aortic root complexVentriculo-aortic junctionAortic valve apparatus

Not applicable (Anatomical structure)