Assertion: mediastinum | /r/HasProperty | a sub group
Facets:
value: to the thoracic cavity
type: LOCATION
Source sentences:
text: i choose Thoracic and she marked it wrong, but Thoracic is the cavity she had to go through to get to the heart, and the Mediastinum is a sub group to the Thoracic cavity, but does that mean its a cavity itself?