Which layer forms the outer protective layer of the heart and is composed of loose connective tissue with elastic fibers?

Which layer forms the outer protective layer of the heart and is composed of loose connective tissue with elastic fibers?

• A. Epicardium
• B. Myocardium
• C. Endocardium
• D. Pericardium

Answer: (A)

The outer surface of the heart is covered by the epicardium, which is the visceral layer of the serous pericardium. This layer is made up of loose connective tissue with elastic fibers (often with some adipose tissue), providing a smooth, protective covering that reduces friction as the heart moves. It also houses small vessels that supply the heart itself. The muscular middle layer beneath is the myocardium, which does the beating. The lining inside the heart chambers is the endocardium. The pericardium is the outer fibrous sac surrounding the heart, with its own inner serous layer (the parietal serous pericardium) and the epicardium being the part that directly covers the heart itself.

The outer surface of the heart is covered by the epicardium, which is the visceral layer of the serous pericardium. This layer is made up of loose connective tissue with elastic fibers (often with some adipose tissue), providing a smooth, protective covering that reduces friction as the heart moves. It also houses small vessels that supply the heart itself. The muscular middle layer beneath is the myocardium, which does the beating. The lining inside the heart chambers is the endocardium. The pericardium is the outer fibrous sac surrounding the heart, with its own inner serous layer (the parietal serous pericardium) and the epicardium being the part that directly covers the heart itself.