Yes
The heart is made of muscle, connective, epithelium, and nervous tissue.
The muscle layer of the heart is the myocardium (or cardiac muscle).
The heart is a main organ . to protect it self from the external effects through cardiac layers which are number in 2 the space between them filled with pericardiacfluid .
The myocardium is not the innermost layer of the heart, the endocardium is.
The thick muscle layer of the heart is the myocardium. It is the middle layer of the heart and produces pressure.
The Endocardium, the inner layer of the heart.
Myocardium
Epicardium is the outer layer of heart tissue. When considered as part of the pericardium, it is the inner layer, continuous with the serial layer.
The endocardium is the innermost layer of the heart wall.
The myocardium (middle layer)
The middle layer of the heart is the myocardium
The thick layer of the heart wall that contains contractile cardiac muscle tissue is the myocardium. The layer of the heart wall synonymous with the visceral layer of the serous pericardium is epicardium.