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Figure 7 (a) The cardiac base is displayed to show the central location of the aortic valve and proximity of the non-coronary AS to the paraseptal region between right and left atria. (b and c) A heart specimen is sectioned in the paracoronal plane to show the rightward extent of the non-coronary AS (black arrows) and the right atrial wall (blue arrows). The green arrow indicates the membranous septum. The filled shape marks the location of the atrioventricular node; the asterisk denotes the His bundle, and the branching atrioventricular conduction bundle is represented by the blue line. (d) This simulated parasternal long axis cut through a heart specimen shows the leftward extent of the non-coronary AS (black arrows) overlying the left atrial wall (red arrows). (e) This histologic section stained with van Gieson stain corresponds to the cut shown in panel D. On the ventricular aspect there is fibrous continuity (open arrow) between aortic and mitral valve. On the atrial aspect, left atrial myocardium overlaps the fibrous continuity. Scale bars are 1 cm. LCA = left coronary artery; LV = left ventricle; MV = mitral valve; R = right coronary AS; other abbreviations as in preceding figures.
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