PATHOLOGY

Detailed explanation-1: -The muscle layer of the heart is termed the myocardium and is made up of cardiomyocytes. The myocardium is found in the walls of all four chambers of the heart, though it is thicker in the ventricles and thinner in the atria.

Detailed explanation-2: -The myocardium is not smooth muscle. The myocardium is the thick, middle layer of the heart that is made of cardiac muscle. Cardiac muscle is the type of muscle that exclusively makes up the heart.

Detailed explanation-3: -The myocardium is the muscular layer of the heart. It consists of cardiac muscle cells (cardiac myocytes [also known as cardiac rhabdomyocytes] or cardiomyocytes) arranged in overlapping spiral patterns.