Assertion: mediastinum's heart | /r/HasProperty | tissue
Facets:
value: between the two lungs
type: LOCATION
Source sentences:
text: The membrane continues over the lung, where it is called the visceral pleura, and over part of the esophagus, the heart, and the great vessels, as the mediastinal pleura, the mediastinum being the space and the tissues and structures between the two lungs.