The tendon of Todaro is a collagenous band within the subendocardium that constitutes part of the fibrous skeleton of the heart. It originates from the central fibrous body. It is palpable in the right atrium running from the interatrial septum inferiorly and to the right to the inferomedial part of the inferior vena caval valve.
It forms the anterosuperior boundary of the triangular area of Koch.
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