visceral pericardium

English Thesaurus

1. the innermost of the two layers of the pericardium (noun.body)

hypernym	:	serosa, serous membrane,
definition	:	a thin membrane lining the closed cavities of the body; has two layers with a space between that is filled with serous fluid (noun.body)

part meronym	:	pericardium,
definition	:	a serous membrane with two layers that surrounds the heart (noun.body)