Assertion: pericardium's layer | /r/CapableOf | compose of strong fibrous tissue
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Source sentences:
text: It is a closed sac having two layers: the visceral layer (epicardium), immediately surrounding and applied to all the heart's surfaces, and the outer parietal layer, forming the sac, composed of strong fibrous tissue (fibrous pericardium [TA]) lined with a serous membrane (serous pericardium [TA]).