In anatomy, a septum (Latin for something that encloses; plural septa) is a wall, dividing a cavity or structure into smaller ones. Examples In human anatomy Interatrial septum, the wall of tissue that separates the left and right atria of the heart Interventricular septum or median septum, the wall separating the left and right ventricles of the heart Lingual septum, a vertical layer of fibrous tissue that separates the halves of the tongueNasal septum: the cartilage wall separating the nost… (More on Septum)