The model shows the cross-sectional structure of the eighth thoracic vertebra in detail. According to the normal anatomical posture, the mediastinum is cut horizontally. It reflects the cross-sectional relationship of pulmonary fissure, pulmonary artery, vein and bronchus, pleura, intercostal muscle, anterior and left and right thoracic muscles. At the same time, it can also show the structure and adjacent relationship of the spine and spinal cord through this plane. The anterior part shows the left and right atrium Ventricles, etc.