mediastinum /me·di·as·ti·num/ (me″de-ah-sti´num) pl. mediasti´na [L.]
1. a median septum or partition.
2. the mass of tissues and organs separating the two pleural sacs, between the sternum in front and the vertebral column behind, containing the heart and its large vessels, trachea, esophagus, thymus, lymph nodes, and other structures and tissues; it is divided into superior and inferior regions, the latter subdivided into anterior, middle, and posterior parts. 
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Subdivisions of the mediastinum.
mediastinum tes´tis the partial septum of the testis, formed near its posterior border by a continuation of the tunica albuginea.
| mediastinum testis n. A mass of connective tissue at the back of the testis that encloses the rete testis. |
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