The fibrous skeleton of the heart is best defined as those tissues at the base of the heart which consists of dense collagen fibers which remain stationary with respect to functionally moving parts of the heart namely myocardium, valve leaflets and elastically distensible arteries arising from the heart. So far no clear guidelines are available for dissecting the fibrous skeleton of the heart. The present study evolves the steps in dissecting the fibrous skeleton of the cadaverichearts. Its morphological features such as position, shape and extent are noted. Aim of the study is to dissect the fibrous skeleton of the heart andexplain its dissection steps. Fibrous skeleton is situated at the base of the heart where four functional apertures of the ventricles are crowded together. In fetal life the atrioventricular annuli are in the same plane but in adult they are oblique i.e. at 450 and are connected with each other by right and left trigone, which appears as figure of 8. The atrioventricular conducting bundle is only physiological connection between the atria and ventricle across the fibrous ring. The right and left trigone, aortic and pulmonary annuli, conus ligament, membranous septum, tendon of Todaro were dissected and observed. Fibrous skeleton of the heart & its three dimensional views are helpful for both undergraduate and post graduate students of anatomy and cardiology. It would also help cardio-thoracic surgeons in Annuloplasty operations.

Keywords: Fibrous Skeleton of the Heart; Key Stone; Left Trigone; Conus Ligament; Annuli.