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Figure 6 Heart specimens illustrating the anatomic arrangement between the right ventricular outflow tract (RVOT) and the aortic sinuses. (a) Viewed anteriorly, the RVOT passes leftward and superior to the aortic valve. (b) The posterior view shows the left (L) and right (R) coronary aortic sinuses adjacent to the pulmonary infundibulum. The noncoronary (N) aortic sinus is remote from the RVOT, but is related to the mitral valve (MV) and central fibrous body. The dotted line marks the ventriculo-arterial junction (VAJ) between the wall of the pulmonary trunk (PT) and right ventricular muscle. Note the cleavage plane behind the pulmonary infundibulum and in front of the aortic root. (c and d) These simulated parasternal long-axis sections show two halves of the same heart and display the left and right coronary orifices. The right- and left-facing pulmonary sinuses (R and L in circles, respectively) are situated superior to the aortic sinuses. The dotted line marks the epicardial aspect of the subpulmonary infundibulum in the so-called "septal" area. LAA = left atrial appendage; LCA = left coronary artery; LV = left ventricle; RAA = right atrial appendage; RCA = right coronary artery; SCV = superior vena cava; TV = tricuspid valve; VS = ventricular septum.
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