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Modality: Anatomic specimen

Orientation: Anterior, right ventricular view

Description: A portion of the septal leaflet of the tricuspid valve has been removed in this close up view of the right atrioventricular junction. A light placed behind the membranous septum demonstrates both the atrioventricular (yellow arrow) and interventricular (red arrow) components, the black line marking where the tricuspid valve divides the two portions. The atrioventricular node (red diamond) is usually located within the musculature of the antero-inferior buttress of the atrial septum at the apex of the triangle of Koch. The triangle of Koch itself is delineated by the tendon of Todaro, which is a continuation of the Eustachian valve, and the hinge line of the septal leaflet of the tricuspid valve. The coronary sinus lies at the base of the triangle. The septomarginal trabeculation (yellow ‘Y’) divided at the ventricular base into two limbs, with the supraventricular crest inserting between the limbs. The medial papillary muscle arises from the postero-caudal limb, while the antero-cephalad limb extends to to support the leftward adjacent leaflet of the pulmonary valve.  For a left ventricular view of this heart, please see companion image A010100-135a.
Contributor: Diane E. Spicer, BS

Institution: The Congenital Heart Institute of Florida (CHIF)

Image Label:  A010100-134a

Source of Image: The Congenital Heart Institute of Florida (CHIF)

Image Certification: pending

AWG Rating: pending