Right Ventricle (IV)

After removal of the lateral portion of the lateral wall of the right ventricle and the anterior portion of the infundibulum (right ventricular outflow tract)  the septal leaflet of the tricuspid valve is seen.  This leaflet is anchored by chordae tendineae which insert directly into the septal trabeculations rather than papillary muscles.  
A broad band of muscle separates the inflow from the outflow tract of the right ventricle, this is the crista supra ventricularis (CSV).  The septomarginal trabecula (SMT) or moderator band as it arises from the crista supraventricularis (CSV).

E. Close up of the right atrium and the basal portion of the right ventricle showing the relationship of the crista supraventricularis (CSV) and the aortic root, the latter bulging into and thus shaping the contour of the crista. Note the absence of myocardium in a small segment of the upper border of the tricuspid valve (asterisk). This corresponds to the membranous portion of the interventricular septum, as seen from the right side of the heart. This anatomical relationship between the root of the aorta, the anterior right atrial wall (at the site of the torus aorticus), and the right ventricular outflow tract demonstrates the possible pathways for the formation of acquired left to right shunts in cases of aneurysmal dilatation and or perforation of the aortic sinuses of Valsalva.
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