ANATOMY

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: -Myocardium – a thick, muscular middle layer that contracts and relaxes to pump blood around of your heart.

Detailed explanation-3: -The myocardium is the middle muscular layer of the heart. It is the thickest layer which lies between the single-cell endocardium layer, and the outer epicardium, which makes up the visceral pericardium that surrounds and protects the heart. The myocardium is composed of specialized muscle cells called cardiomyocytes.

Detailed explanation-4: -Pericardium, or the layer surrounding the heart. Epicardium, the outside layer of the heart. Myocardium, the middle layer of the heart. Endocardium, the innermost layer of the heart.

Detailed explanation-5: -The endocardium consists of a single layer of endothelial cells lining the chambers of the heart. Occasionally, small amounts of smooth muscle can also be in the endocardium. Compared to the right atrium, the left atrium has a thicker endocardium because of high pressure from the pulmonary veins.