Chapter 15 Compare the layers of the heart wall
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endocardium
consists of epithelium and connective tissue containing many elastic and collagenous fibers.
epicardium (visceral pericardium)
functions as a protective layer. This layer consists of connective tissue covered by epithelium. Its deeper portion often contains adipose tissue.
myocardium
is relatively thick and consists largely of cardiac muscle tissue. The muscle fibers are arranged in planes, separated by connective tissues, which are richly supplied with blood capillaries, lymph capillaries, and nerve fibers.
The connective tissues house the Purkinje fibers,
which function with the conduction system of the heart. This layer is continuous with the inner linings of the blood vessels attached to the heart.
