这个词是什么意思？
A membrane in the midline of the THORAX of mammals. It separates the lungs between the STERNUM in front and the VERTEBRAL COLUMN behind. It also surrounds the HEART, TRACHEA, ESOPHAGUS, THYMUS, and LYMPH NODES.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D008482 · MeSH 2026。
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