Assertion: mediastinum's heart | /r/HasProperty | main pulmonary artery
Facets:
Source sentences:
text: The middle mediastinum contains the heart, the main pulmonary artery and its principal branches, the aorta, the azygos vein, thoracic duct, carina and mainstem bronchi, tracheobronchial lymph nodes, esophagus, phrenic nerves, vagus nerve, and the thymus.