A common name for the septum in the heart is the "interventricular septum." This muscular wall separates the left and right ventricles, two of the heart’s four chambers. Its primary function is to prevent the mixing of oxygenated blood from the left ventricle and deoxygenated blood from the right ventricle, thereby ensuring efficient circulation. The interventricular septum also supports the heart's structure and contributes to the heart's electrical conduction system, which regulates heartbeats. Any abnormalities in this septum can lead to serious cardiovascular issues, necessitating medical attention for proper diagnosis and treatment.