Three-layered ventricular septum of the helical heart: functional anatomy and clinical relevance

Results IVS displays significant fiber disarray at the boundaries of LV and RV free walls, and contains an intriguing structure that may be freshly examined by the HVMB dissection. These dissections contradict the concept that the interventricular septum belongs to the LV, since both ventricles participate in its formation. Ascending and descending segments od the HVMB provide the origin and significance of mayor “septal fiber crossing”. Conventional low resolution ultrasound imaging of the ventricular septum previously identified the border of this crossing as hyperechogenic “septal line”. We suspect the overlap of the crossing of descending and ascending segments creates this “bright line”. Histological analyses have shown that septal RV and LV fibers create a connective tissue true space. Coronary artery septal branches run through this space, a fact, which may be useful in Ross’ procedure.