Pulmonary fibrous ring

The pulmonary fibrous ring (anulus fibrosus trunci pulmonalis) in the heart is a dense connective tissue structure that surrounds the pulmonary valve orifice at the base of the pulmonary trunk. It forms part of the fibrous skeleton of the heart and provides structural support for the attachment of the pulmonary valve cusps, helping maintain the shape and stability of the outflow tract during the cardiac cycle. Compared to the aortic fibrous ring, it is thinner and is less firmly integrated into the central fibrous body, but it still contributes to the overall mechanical framework of the heart and serves as an anchoring site for adjacent myocardial fibers.

His shape is analogous to the aortic fibrous ring, forming a virtual, crown-shaped (coronet-shaped) structure formed by connecting the basal attachment points (nadirs) of the three aortic valve leaflets