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The double-layered membrane surrounding the heart is called the pericardium. The pericardium is a thick, membranous sac that secretes a lubricating liquid. There is a thin inner layer that sits directly on and is attached to the surface of the heart, called the epicardium. There is a very small space, which usually has a very small amount of fluid, called the pericardial space, and a tough outer layer called the pericardium (peri = around and cardium = heart).

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The internal layer of the tissue in the heart is the epicardium?

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Yes, the prefix in the word epicardium, epi- means outer, which in this case is the outer layer of the heart.


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