<prompt> Tendon of Todaro connectsCoronary sinus to tricuspid valve annulusRidge of muscle connecting IVC and SVCValve in opening of IVCRaised interatrial ridge  <response>: Tendon of Todaro is a pa of Kochs triangle Base: ostium of coronary sinus Superior boundary: tendon of Todaro connects central fibrous body. Inferior boundary: septal cusp of tricuspid value. Apex: bundle of his AV node. 