#mediastinum  the part of the thoracic cavity between the lungs that contains the heart and aorta and esophagus and trachea and thymus
  supertype:  bodily_cavity__cavity__cavum  (anatomy) a natural hollow or sinus within the body
  part of:  chest_cavity__chestcavity__thoraciccavity  the cavity in the vertebrate body enclosed by the ribs between the diaphragm and the neck and containing the lungs and heart
     part of:  pectus__thorax__chest  the part of the human body between the neck and the diaphragm or the corresponding part in other vertebrates
        part of:  vertebrate__craniate  animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium
        part of:  torso__trunk__body  the body excluding the head and neck and limbs; "they moved their arms and legs and bodies"
           part of:  body__organic_structure__organicstructure__physical_structure  the entire physical structure of an organism (especially an animal or human being); "he felt as if his whole body were on fire"

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