superior mediastinum

(redirected from mediastinum superius)

su·pe·ri·or me·di·as·ti·num

[TA]
part of the mediastinum lying superior to the horizontal plane intersecting the sternal angle and approximately the T4-5 intervertebral disc (that is, 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 esophagus, the thoracic duct, the thymus, and the phrenic, vagus, cardiac, and left recurrent laryngeal nerves.
Synonym(s): mediastinum superius [TA]

superior mediastinum

the upper part of the mediastinum in the middle of the thorax, containing the trachea, the esophagus, the aortic arch, and the origins of the sternohyoideus and the sternothyroideus. Compare anterior mediastinum, middle mediastinum, posterior mediastinum.