Glossary Term:

Title

mediastinum

Phonetic

<b>me</b>-dee-uh-<b>STY</b>-num

Description

any structure or area of the body that is between other parts, such as the nasal septum that separates the 2 nostrils. Commonly refers to the central part of the chest, which is surrounded by the breastbone, the backbone, and both lungs. The chest mediastinum contains the heart, large blood vessels, trachea, esophagus, and lymph nodes. See also lymph nodes.