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.
The Pax Romana. The term Pax Romana, which literally means Roman peace, refers to the time period from 27 B.C.E. to 180 C.E. in the Roman Empire.This 200-year period saw unprecedented peace and economic prosperity throughout the Empire, which spanned from England in the north to Morocco in the south and Iraq in the east.he Pax Romana began when Octavian became the leader of the Roman Empire. After the murder of Julius Caesar, a period of civil war erupted in Rome.