Assertion: endocardium's layer | /r/HasProperty | conical sac of fibrous tissue
Facets:
Source sentences:
text: Epicardium: The inner layer of the pericardium, a conical sac of fibrous tissue that surrounds the heart and the roots of the great blood vessels
text: The inner layer of the pericardium, a conical sac of fibrous tissue that surrounds the heart and the roots of the great blood vessels.