Composition of the heart tissue

• The endocardium is the layer of epithelium that surrounds the heart lumen
• Endocarium = endo → inside
• myocardium = myo → muscle
• epicardium = epi → outside
• pericardium = peri → surrounding
• The myocardium is layer of cardiac myoblast that surrounds the endocardial tubes
• The cardiac jelly is a thick layer of extracellular matrix deposits of the myocardium
• The epicardium is a epicardial layer formed of proepicardium
• The pericardial cavity is filled with serous fluid
• The pericardium protects the heart from external shocks