PATHOLOGY

Detailed explanation-1: -The two sides of the heart are separated by a thin tissue wall called the septum. The septum is two types i.e. atrial septum and ventricular septum. The septum which is present between the right and left atrium is known as the atrial septum.

Detailed explanation-2: -The heart is made up of four chambers. The upper two chambers are called atria (singular: atrium) and the lower two are known as ventricles (singular: ventricle). Muscular walls, called septa or septum, divide the heart into two sides.