( A ) The thoracic chamber is formed dorsally by the vertebral column, ventrally by the sternum.
( B ) The lungs are situated in the thoracic chamber which is anatomically an air-tight chamber.
( C ) The anatomical setup of lungs in thorax is such that any change in the volume of the thoracic cavity will not be reflected in the lung (pulmonary) cavity
( D ) The thoracic chamber is formed laterally by the ribs and on the lower side by the dome-shaped diaphragm.
