"The interventricular septum divides the right and left ventricles, running in the plane of the anterior and posterior interventicular grooves. Septation of the ventricles occurs in the fetus within 7 weeks of gestation, achieved by the formation of this embryologically heterogenous structure 6."
"The comparatively diminutive membranous component is found between the outflow tracts of the left and right ventricles, anterior to the right fibrous trigone, posterior to the right coronary sinus, and continuous with the muscular septum 2. It is further sub-divided by the septal leaflet of the tricuspid valve: superior to the tricuspid valve attachment, the septum is inter-atrial whereas the portion inferior to the tricuspid valve is the true interventricular (ventricular) portion."
Expected headings
"Echocardiography"
"Roughly triangular in shape, the septum extends in three planes; anteriorly (in an antero-superior direction), inferiorly (rightward and inferolateral direction) and apically (toward the left ventricular apex). The apical two-thirds of the ventricular septum is heavily trabeculated, with a smooth walled basal one-third 6."