The left and right sides of the heart are separated by a muscular wall called the septum. More specifically:
- The interventricular septum is the thick, muscular partition that separates the left and right ventricles, the lower chambers of the heart. It has two parts: a thick muscular part and a thin membranous part
- Additionally, the left and right atria, the upper chambers, are separated by the interatrial septum , another muscular wall
This septum prevents the mixing of oxygen-rich blood on the left side with oxygen-poor blood on the right side, maintaining efficient circulation
. In summary, the septum -comprising the interventricular septum between ventricles and the interatrial septum between atria-is the key structure that separates the left and right sides of the heart
