The three lobes of the right lung are the upper right lung, the middle right lung and the lower right lung. The lungs are divided into the left and right lungs, with the right lung divided into three lobes and the left lung into two lobes. The components of the lungs are the branches of the bronchial tubes as well as the alveoli and the interstitium. The bronchial tubes at all levels form the scaffolding of the lungs, and the trachea divides into the left and right main bronchial tubes into the left and right lungs, respectively. The right main bronchus can be divided into three lobe bronchioles, namely, the right upper lobe bronchus, the right middle lobe bronchus, and the right lower lobe bronchus; the right upper lobe bronchus and the lung tissue to which it belongs to is the right upper lobe. Similarly, the right middle lobe bronchus and the right lower lobe bronchus correspond to the right middle lobe and the right lower lobe, respectively.