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The inferior pyramidal space refers to an anatomical region of the heart where the interatrial groove, interventricular groove, and right and left atrioventricular grooves converge. It wedges toward the central fibrous body. It is surrounded by the coronary arteries, coronary sinus, atrioventricular valve attachments, interatrial septum, interventricular septum, coronary aortic sinuses, and the cardiac conduction system.
The tendon of inferior pyramidal space, or Tendon of Todaro is a fibrous band located within the right atrium of the heart. The Tendon of Todaro serves as a landmark within the heart, helping to define the boundaries of important anatomical structures and regions
The right fibrous trigone is the triangular formation situated between the aortic valve and the medial parts of the tricuspid and mitral valves. It is the major component of the central fibrous body.
The central fibrous body is the largest thickening and the strongest portion of the cardiac skeleton. It occupies a central position, surrounded by the valve rings. This structure, being electrically inert, helps to isolate the atria from the ventricles, except at the site of penetration of the AV conducting system.
The left fibrous trigone is a thick part of the fibrous cardiac skeleton, where the aortic and bicuspid mitral valves meet. It is represented by thick connective tissue at the left end of the area where the left fibrous ring meets the aortic valve.