Question: what are the two dominant systems in the thoracic cavity
Answer: m , including the heart and great vessels , which include the thoracic aorta , the pulmonary artery and all its branches , the superior and inferior vena cava , the pulmonary veins , and the azygos vein structures of the respiratory system , including the Diaphragm , trachea , bronchi and lungs structures of the digestive system , including the esophagus , endocrine glands , including the thymus gland , structures of the nervous system including the paired vagus nerves , and the paired sympathetic chains , lymphatics including the thoracic duct .