Source: Suneel Dhand, MD, Attending Physician, Internal Medicine, Beth Israel Deaconess Medical Center Learning the proper technique for percussion and auscultation of the respiratory system is vital and comes with practice on real patients. Percussion is a useful skill that is often skipped during everyday clinical practice, but if performed correctly, it can help the physician to identify underlying lung pathology. Auscultation can provide an almost immediate diagnosis for a number of acute pulmonary conditions, including chronic obstructive pulmonary disease (COPD), asthma, pneumonia, and pneumothorax. The areas for auscultating the lungs correspond to the lung zones. Each lung lobe can be pictured underneath the chest wall during percussion and auscultation (Figure 1). The right lung has three lobes: the superior, middle, and inferior lobes. The left lung has two lobes: the superior and inferior lobes. The superior lobe of the left lung also has a separate projection known as the lingual. Figure 1. Anatomy of lungs with respect to the chest wall. An approximate projection of lungs and their fissures and lobes to the chest wall anteriorly. RUL - right upper lobe; RML - right middle lobe; RLL - right lower lobe; LUL - left upper lobe; LLL - left lower lobe.