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All of the following statements concerning the mediastinum are correct except
A.
The mediastinum forms a partition between the two pleural cavities.
B.
The mediastinal pleura demarcate the lateral boundaries of the mediastinum.
C.
The heart occupies the middle mediastinum.
D.
Should air enter the left pleural cavity, the structures forming the mediastinum are deflected to the right.
E.
The anterior boundary of the mediastinum extends to a lower level than the posterior boundary.