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Mediastinum
Pronunciation
Definition 1
The area between the lungs. The organs in this area include the heart and its large blood vessels, the trachea, the esophagus, the thymus, and lymph nodes but not the lungs. (NCI Dictionary)
Definition 2
A group of organs surrounded by loose connective tissue, separating the two pleural sacs, between the sternum anteriorly and the vertebral column posteriorly as well as from the thoracic inlet superiorly to the diaphragm inferiorly. The mediastinum contains the heart and pericardium, the bases of the great vessels, the trachea and bronchi, esophagus, thymus, lymph nodes, thoracic duct, phrenic and vagus nerves, and other structures and tissues. (NCI Thesaurus)
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