visceral pericardium endocardium myocardium parietal pericardium pericardial cavity The heart is covered by a pericardial sac. The outer layer of the sac is fibrous connective tissue layer called the The is a serous connective tissue layer that's directly adhered to the heart's surface. Between these two layers is the which is filled with pericardial fluid and serves to cushion the heart. The is the thick muscular layer of the heart that makes-up the bulk of the chamber walls. It is thicker in heart chambers that pump blood farther distances, such as the left ventricle, and thinner in the atria that do not pump blood very long distances. The innermost heart layer is which has a slippery surface to prevent blood from sticking to the heart chamber walls. the

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