GROSS ANATOMY

Detailed explanation-1: -A wall of muscle called the septum separates the left and right atria and the left and right ventricles. These are referred to as the atrial and ventricular septum.

Detailed explanation-2: -The interventricular septum separates the ventricles and allows for proper blood flow through the heart: from the right atrium through the tricuspid valve to the right ventricle to the lungs, back to the left atrium, followed by the left ventricle through the mitral valve.

Detailed explanation-3: -The heart has four chambers: two upper chambers call the right and left atrium and two lower chambers called the right and left ventricle. There is a wall between the two atria called the atrial septum. There is another wall between the two ventricles, and it is called the ventricular septum.

Detailed explanation-4: -septum (SEP-tum): The septum is a thick wall of muscle that divides the heart. It separates the left and right sides of the heart.

Detailed explanation-5: -The left bundle branch descends through the interventricular septum and divides into three fascicles of the Purkinje fibers in the left ventricle near at the apex (i.e., left anterior fascicle, left posterior fascicle and left septal fascicle).