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| Valves in heart | Location |
| (1) Bicuspid/Mitral valve | (a) Opening of inferior vena cava |
| (2) Tricuspid valve | (b) Opening of coronary sinus |
| (3) Eustachian valve | (c) Left atrioventricular aperture |
| (4) Thebesian valve | (d) Right atrioventricular aperture |