Figure 1218

Fibrous skeleton of the heart as seen with the two atria removed.

This fibrous network (indicated in blue) serves for the attachment of cardiac muscle; it also serves for the attachment of the cuspid valves between the atria and ventricles and for the semilunar valves of the aorta and the pulmonary artery. The atrioventricular bundle passes from the right atrium to the ventricular septum via the membranous septum of the fibrous skeleton.

right atrium atrioventricular (A-V) node

A-V bundle conus ligament fibrous ring of pulmonary trunk fibrous ring of aorta left fibrous trigone fibrous ring of mitral valve right fibrous trigone

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