What is the function of vestibule in nose?

The vestibule is the innermost part of the nose, and it serves several important functions:

1. Filtration of Inhaled Air: The vestibule is lined with coarse hair and mucus-secreting glands that help filter out dust, pollen, and other particles from the inhaled air. These particles are trapped by the mucus and moved away from the lungs, preventing respiratory irritation and infection.

2. Warming and Humidification of Inhaled Air: The vestibule helps to warm and humidify the inhaled air before it reaches the lungs. The warm and humid air is easier for the lungs to process, and it helps prevent drying and irritation of the delicate lung tissues.

3. Olfactory Function: The vestibule contains the openings of the olfactory glands, which are responsible for our sense of smell. These glands produce mucus that contains odor-binding proteins, which help detect and transmit odor molecules to the olfactory nerve cells. The olfactory nerve then transmits these signals to the brain, allowing us to perceive and discriminate between different smells.

4. Defense Against Pathogens: The vestibule also plays a role in defending against pathogens, such as viruses and bacteria. The mucus produced in the vestibule contains various antimicrobial substances, including immunoglobulins, lysozymes, and defensins, which help trap and kill harmful microorganisms.

5. Resonance and Speech Production: The vestibule, along with the nasal cavity, helps to modify and amplify the sounds produced during speech. It contributes to the resonance and quality of the human voice, allowing for clear communication.

Overall, the vestibule serves as a protective gateway to the respiratory and olfactory systems, providing essential functions for air filtration, humidification, defense against pathogens, and speech production.