The double layer of membrane that makes up the outside of each lung is known as the mediastinum.

Name: The double layer of membrane that makes up the outside of each lung is known as the mediastinum.
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The double layer of membrane that makes up the outside of each lung is actually known as the pleura. The mediastinum is a space in the middle of the chest that contains the heart, major blood vessels, esophagus, and other structures.

The Double Layer of Membrane That Makes Up the Outside