Triangle of Koch is the landmark for :
Triangle of KochTriangular area in right atrium- Marks the site of AV NODEBoundaries- Anterior : Base of septal leaflet of tricuspid valve- Posterior : Anteromedial margin of opening of coronary sinus- Superiorly : Tendon of Todaro
SA node
Bundle of His
AV node
Purkinje fibres
Surfaces and Grooves