👉 The term "mediastine" is a medical term that refers to the space between the lungs and the trachea, which is located in the midline of the chest. This region is important for the exchange of gases between the airway and the blood, as well as for the movement of cerebrospinal fluid (CSF) through the medulla oblongata, which is a part of the brainstem. In medical terms, mediastine refers to the lower portion of