This chapter cover introduction, dissection, applied anatomy and living anatomy of thorax. 33 well illustrated photographs, pictures and diagrams are included in this chapter. Each topic has applied anatomy at the end. Description of lungs, heart, diaphragm, mediastinum and muscles of intercostal spaces are given in 7 tables to facilitate quick learning. Intercostal spaces, lungs, heart, pericardium, pleura, mediastinum, arch of aorta, diaphragm, trachea, oesophagus, coronary arteries, coronary sinus, cardiac plexus, thoracic duct and superior vena cava are explained in detail. Dissection steps and incision for each part of thorax are given separately. Review questions for each topic are given at the end of the chapter.