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Laboratory 21. Mediastinum
Step 2. The Middle Mediastinum

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Identify the boundaries of the middle mediastinum . It is bounded both anteriorly and posteriorly by the fibrous and serous parietal layers of the pericardium. Superiorly, its boundary is defined as the horizontal plane through the sternal angle (of Louis) and the intervertebral disc T4/T5. Inferiorly, it extends as far as the diaphragm. The middle mediastinum includes structures which lie lateral to the pericardial sac.

Identify the structures of the middle mediastinum. These include the:

Finally, remove the remaining portions
of the pericardial sac before studying
the remainder of the mediastinum.