Assertion: pericardium's heart | /r/CapableOf | draw down a fold of the membrane
Facets:
Source sentences:
text: The two primitive aortae lie at first in the ventral wall of the ​pericardium, but with the folding over they come to lie in the dorsal wall and gradually bulge into the cavity as they coalesce to form the heart, so that the heart drops into the dorsal side of the pericardium and draws down a fold of the membrane called the dorsal mesocardium.