The lungs are the respiratory organs of the human body, which are located in the thoracic cavity, on both sides of the mediastinum, and are divided into the left and right lungs.
Lungs in the human body surface projection: the tip of the lungs above the medial 1/3 of the clavicle 2 ~ 3cm; anterior boundary and chest wall is roughly the same, only the left lung anterior boundary in the 4th thoracic rib joints, along the 4th costal cartilage to turn to the outside, to the left sternal paraproximal line slightly medial to turn down to the 6th rib cartilage mid-point to the lower boundaries of the move. The lower border of the lungs is about two ribs higher than the lower border of the chest wall membrane at each of the landmarks, i.e., at the midclavicular line where it intersects with the 6th rib, at the midaxillary line where it intersects with the 8th rib, and finally on the lateral side of the spine up to the plane of the spinous process of the 10th thoracic vertebra.
As the heart is close to the chest cavity, the two lungs are not identical in shape, the left lung is narrow and long, the right lung is wide and short, the left lung is divided into upper and lower lobes by oblique fissure, and the right lung is divided into upper, middle and lower lobes by horizontal and oblique fissures.
If pneumothorax or pleural effusion occurs, the position of the lungs may change accordingly, and it is recommended to consult a doctor in case of discomfort.