| Chordae tendineae | |
|---|---|
| Interior of right side of heart. | |
| The chordae tendineae are the tendons connecting the valves to the heart muscle | |
| Latin | chordae tendineae cordis |
| Gray's | subject #138 532 |
| MeSH | Chordae+Tendineae |
The chordae tendineae, or heart strings, are cord-like tendons that connect the papillary muscles to the tricuspid valve and the mitral valve in the heart.
Chordae tendineae are approximately 80% collagen, while the remaining 20% is made up of elastin and endothelial cells.
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During atrial systole, blood flows from the atria to ventricles down the pressure gradient. Chordae tendineae are relaxed because the atrioventricular valves are forced open.[1]
When the ventricles of the heart contract in ventricular systole, the increased blood pressures in both chambers push the tricuspid valve and mitral valve 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.[1]
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 centre of the triangle of Koch is the location of the atrioventricular node.
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