Assertion: mediastinum's part | /r/HasProperty | pulled into the thoracic cavity
Facets:
value: by great vessels
type: OTHER
value: by the descendent heart
type: OTHER
Source sentences:
text: During the embryonic developmental period of thyroid gland, part or all of the thyroid blastoma leaves primordium and is pulled into the thoracic cavity by the descendent heart and great vessels, then continues to develop in the thoracic cavity, forming the final primary intrathoracic goiter.