The nasal cavity is based on bony nasal cavity and cartilage, and the surface is lined with mucous membrane and skin. The nose is composed of external nose, nasal cavity and sinuses. The three-dimensional structure of nasal cavity is the basis of maintaining normal nasal physiological function. The nasal cavity is divided into left and right cavities by the nasal septum, the front through the nostrils to the outside world, the rear through the nasal aperture to the pharyngeal cavity. Each nasal cavity communicates with each of the four sinuses by means of deep and concealed sinus openings; The si