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The chordae tendineae are the tendons connecting the valves to the heart muscle
Papillary muscles and chordae tendineae
|Latin||chordae tendineae cordis|
Tendon of Todaro
The tendon of Todaro is a continuation of the Eustachian valve of the inferior vena cava and the Thebesian valve of the coronary sinus. Along with the opening of the coronary sinus and the septal cusp of the tricuspid valve, it makes up the triangle of Koch. The apex of the triangle of Koch is the location of the atrioventricular node.
When the ventricles of the heart contract in ventricular systole, the increased blood pressures in both chambers push the AV valves to close simultaneously, preventing backflow of blood into the atria. Since the blood pressure in atria is much lower than that in the ventricles, the flaps attempt to evert to the low pressure regions. The chordae tendineae prevent the eversion, prolapse, by becoming tense thus pulling the flaps, holding them in closed position.