has part has part has_part characteristic of has modifier abnormal thoracic cavity morphology enlarged thoracic cavity increased size of the cavity in the vertebrate body enclosed by the ribcage between the diaphragm and the neck, and contains the lungs, heart, thoracic aorta, pulmonary artery and its branches, thymus gland, and the respiratory airway MPheno.ontology increased thoracic cavity size MP:0004735 abnormal increased size thoracic cavity