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Medical Definition of Mediastinum superius
1. That part lying above, i.e., above the pericardium; it contains the arch of the aorta and the vessels arising from it, the brachiocephalic veins, and upper portion of the superior vena cava, the trachea, the oesophagus, the thoracic duct, the thymus, and the phrenic, vagus, cardiac, and left recurrent laryngeal nerves. Synonym: mediastinum superius. (05 Mar 2000)