What is the mediastinum?
a. Membranous sac surrounding the heart and great vessels
b. Middle layer of muscle fibers constituting the heart
c. Point of division of the trachea into the bronchi
d. Structure separating the right and left thoracic cavities
ANS: D
The mediastinum lies between the left and right pleural cavities that contain the lungs (Figure 9-16).
Health Professions
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