Epicardium

Epicardium (heart muscle) is one of the three main layers of the heart wall.   It is the outermost layer of the heart, composed of connective tissue and fat.  The connective tissue secretes a small amount of lubricating fluid into the pericardial cavity. 

In addition to the connective tissue and fat, the epicardium is lined by, on its outer surface, simple epithelial cells.

 References 

Category:Animal tissues
Category:Heart
Category:Muscle tissue
Category:Anatomy of the cardiovascular system
Category:Cardiovascular system