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Learn about the thorax , the middle section of the human body that contains vital organs and structures for breathing, protection, and circulation. Find out the anatomy, musculature, and major organs of the thorax , as well as their functions and clinical aspects. Images in Thorax Iatrogenic thoracic loose body (28 July, 2025) Lei Gao, Dan Su, Xian-Ning Wu How deep can it go? Dangers of delayed diagnosis of teeth aspiration (31 July, 2025) The organs of the thorax include the thymus gland, the breasts, the heart, the lungs, the tracheobronchial tree and the pleurae. The thymus gland is located in the superior mediastinum of the thoracic cavity but may also extend into the neck. Thorax The thorax is the upper part of trunk. Extends from root of the neck to the abdomen. Chest is used as a synonym for thorax . The cavity of trunk is divided by the diaphragm into an upper part called thoracic cavity and the lower part called the abdominal cavity.