<prompt> Boundary of the Kochs triangle is not formed by:Tricuspid valve ringCoronary sinusTendon of todaroLimbus fossa ovalis  <response>: Triangle of koch is landmark for AV node with its transition zone. It is bounded by tendon of todaroQ superiorly, tricuspid valve septal leafletQ inferiorly and coronary sinus orificeQ basally 