The image shows some anatomical areas that can be deduced from an X-ray of a healthy subject.1. Trachea. 2. Clavicle. 3. Posterior portion of the fourth rib. 4. Right main bronchus. 5. Lower margin of the right breast. 6. Gastric air bubble. 7. Left diaphragmatic dome. 8. Left ventricle. 9. Descending aorta. 10. Left pulmonary artery. 11. Left lung.