What is the function of the vestibule in the nose?

The vestibule of the nose serves as the initial entry point for inhaled air, located just inside the nostrils. It is lined with skin and coarse hairs (vibrissae) that help filter out larger particles, such as dust and debris. Additionally, the vestibule helps to humidify and warm the incoming air before it enters the deeper regions of the nasal cavity. This protective role is essential for maintaining respiratory health.