R. H. MCDONALD, M.D.
The mediastinum is that portion of the thoracic cavity which is bounded above by the superior thoracic inlet, below by the diaphragm, posteriorly by the anterior surface of the bodies of the thoracic vertebrae, anteriorly by the posterior surface of the sternum and laterally by the mediastinal reflections of the pleura. It is divided, arbitrarily, into anterior, middle, posterior and superior divisions. The superior division lies above the level of the pericardium and of the other three, the middle division contains the pericardium and heart, while the anterior and posterior divisions are respectively the portions anterior and posterior to the
MCDONALD RH. Enlargement and Displacement of the Mediastinum1. Ann Intern Med. ;1:28–32. doi: 10.7326/0003-4819-1-1-28
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Published: Ann Intern Med. 1927;1(1):28-32.
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