Question

Which is the cardiac muscle layer of the heart?

Answer 1

Myocardium

Explanation:

Human heart has three layers in its wall. They are, from inside outwards :

1. Endocardium
2. Myocardium
3. Pericardium

Of these three layers, the endocardium is an endothelial lining. The myocardium is composed of cardiac muscle and the pericardium is the fibro-serous covering of the heart.

Fig 1 : This diagram shows different layers of heart wall and their composition.

Fig 2: A diagram of the heart and different layers of the wall of the heart.