It is defined by the following structures within the right atrium:
(1) The ostium of the coronary sinus, posteriorly;
(2) the anterior portion of the tricuspid valve annulus; and
(3) the tendon of Todaro (a tendinous structure connecting the valve of the inferior vena cava ostium to the central fibrous body), posteriorly.
Importance in cardiovascular diseases:
used as an anatomical landmark for location of the atrioventricular node during electrophysiology procedures such as pacing or ablation.
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