Aery supply to Koch's triangle is from:
Koch's triangle (and AV node) is supplied by right coronary aery in majority of population. Koch's triangle boundaries tendon of Todaro opening of coronary sinus at the base septal cusp of tricuspid valve (. atrio ventricular valve) AV node at apex
Right coronary aery
Left coronary aery
Left anterior descending aery
Aery from anterior aoic sinus
Thorax: Aerial supply