The ventricular septum is a thick wall of muscle that separates the left and right ventricles of the heart. This structure plays a crucial role in ensuring that oxygen-rich blood from the left ventricle does not mix with oxygen-poor blood from the right ventricle. Proper functioning of the ventricular septum is essential for efficient blood circulation throughout the body. Any defects or abnormalities in this wall can lead to conditions such as ventricular septal defect (VSD), which can affect heart function and overall health.