The nose is composed of external nose, nasal cavity and sinus.

1. The external nose consists of nasal bone, nasal cartilage and soft tissue.

2. The front part of the nasal cavity is called nasal vestibule, which has nasal hair. The top of the nasal cavity is a part of the bottom of the anterior cranial fossa. The inside of the nose is the nasal septum, and there is a rich vascular network in front of it. The surface of the lateral wall of the nasal cavity is irregular, with three vertically downward protrusions, which are called the upper turbinate, the middle turbinate and the lower turbinate respectively. The space below each turbinate is called nasal meatus, that is, upper, middle and lower nasal meatus.

3. Sinus, also known as paranasal sinuses, has four pairs, namely frontal sinus, ethmoidal sinus, maxillary sinus and sphenoid sinus.

Extended data:

The nasal cavity is divided into left and right cavities by nasal septum, with nostrils in front communicating with the outside world and then communicating with the nasopharynx. The front of the nasal cavity is the nasal vestibule, which is covered with skin and has nasal hair, which plays a filtering role and is prone to furuncle. The back part is the proper nasal cavity, lined with mucous membrane, which can be divided into olfactory part and respiratory part. It has the functions of smelling, warming and moistening, and purifying the inhaled air.

The paranasal sinus is located in the skull around the nasal cavity, which is an air-filled cavity and communicates with the nasal cavity, and its mucosa is connected with the nasal mucosa. When the nasal cavity is inflamed, it can spread to the paranasal sinus, causing sinusitis. The paranasal sinus is involved in moistening and heating the inhaled air, and plays a role in pronunciation.

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