Definition of Mediastinum. Mediastinum: The area between the lungs. The organs in the mediastinum include the heart and its large veins and arteries, the trachea, the esophagus, the bronchi, and lymph nodes. Search MedTerms:
The Pax Romana ended because the Roman state had ceased to grow. Boundaries had been set for the Empire, and for the first time the army had become a drain on the econom â¦ y of Rome. Till this point the army provided new slaves and riches from conqured countries.
I saw on wiki that the Pax Romana is considered to have ended in 180 CE. That's a bit odd, IMO, and contrary to what an old history text said. The end of the period of the Good emperors shouldn't be confused with the end of the pax Romana. Ironically, the reign of Commodus, after 180, was far more stable than that of Marcus Aurelius.