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Mediastinum
mediastine (?), Mediastinum (?), n. (NL. mediastinum, fr. L. medius
middle; cf. mediastinus helper, a menial servant, LL.
mediastinus equiv. to medius: cf F.
mediastin.) (Anat.) A partition; a septum;
specifically, the folds of the pleura (and the space included between
them) which divide the thorax into a right and left cavity. The space
included between these folds of the pleura, called the mediastinal
space, contains the heart and gives passage to the esophagus and
great blood vessels.
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