Atrioventricular ( AV) Node ( Tawara , 1906)

Answer to ECG Case # 8
Thanks every one , special thanks to whom mentioned about “Triangle of Koch” : Dr.Nabil Paktin,MD,FACC.

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AV node is a small ovoid structure ( small

er than SA node ) measuring 1x 3×5 mm, lies just beneath the right atrial posterior epicardium , anterior to the ostium of coronary sinus and directly above the insertion of the septal leaflet of Tricuspid valve .
it is located to the apex of the Triangle of Koch formed above by the Tendon of Todaro , infront by the base of the septal leaflet of tricuspid valve and base by the ostium of the coronary sinus .
the tendon of todaro originates from central fibrous body and passes posteriorly through the atrial septum .
the compact AV node becomes the penetrating bundle fo His at the apex of the triangle of Koch and passes through the membranous ventricular septum below the point of attachment of the tendon of todaro to the cnetral fibrous body .
to be not forgotten remember this image .
regards .
COPY RIGHT BELONGS Cardiology & ECG