1. Pay attention to the divisions of parietal pleura 2. Int thoracic a divided into sup. epigastric a. and musculophrenic a 3. Adhesion between lungs neighbouring tissues are seen 4. Identify the structure arrangement of pulmonary hilum 5. Observe the shape lobes and fissures of th lungs 6. Check the cupula of pleura, costomediastinal recess and costodiaphragmatic recess 7. Understand the significance of negative pressure of pleural cavity 8. Identify int and ext intercostal membranes and transversus thoracis 9. Master the routine arrangement location of intercostal blood vessels and nerves 10. Understand the concepts of pleural effusion, hemothorax empyema, chylothorax, and the position of thoracic puncture1. Pay attention to the divisions of parietal pleura. 2. Int.thoracic a.divided into sup.epigastric a. and musculophrenic a. 3. Adhesion between lungs & neighbouring tissues are seen. 4. Identify the structure arrangement of pulmonary hilum. 5. Observe the shape, lobes and fissures of th lungs. 6. Check the cupula of pleura, costomediastinal recess and costodiaphragmatic recess. 7. Understand the significance of negative pressure of pleural cavity. 8. Identify int.and ext intercostal membranes and transversus thoracis. 9. Master the routine, arrangement & location of intercostal blood vessels and nerves. 。 10.Understand the concepts of pleural effusion, hemothorax: empyema, chylothorax, and the position of thoracic puncture