What is Epicardium?
[[File:3D still showing the pericardium layer.jpg|thumb|<center>{{PAGENAME}}</center>]] '''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 == {{reflist}} [[Category:Animal tissues]] [[Category:Heart]] [[Category:Muscle tissue]] [[Category:Anatomy of the cardiovascular system]]