This life size model is composed of 5 parts, including a 2-part heart that provides an interior view of the chambers and valves. The sternum and thymus are removable to reveal the pericardical sac and the major pulmonary and systematic vessels. The trachea and oesophagus are shown entering the Mediastinum through the superior thoracic aperture; the inferior thoracic aperture is distinguishable from the musculature of the diaphragm.