Hairs of vestibule of nose

The hairs of the vestibule of the nose (Vibrissae), are the coarse, stiff hairs located within the nasal vestibule — the skin-lined anterior region of the nasal cavity that extends approximately 1.5 to 2.0 cm from the external nares (nostrils) posteriorly to the limen nasi.

Anatomical Context

The nasal vestibule is lined by keratinized stratified squamous epithelium (skin) rather than respiratory mucosa. This epithelium contains sebaceous glands, apocrine sweat glands, and hair follicles from which the vibrissae arise. The vestibule is bounded laterally by the alar cartilage, medially by the nasal septum and columella, and inferiorly by the nasal floor.

Function

The vibrissae serve as a first-line mechanical filtration barrier for inspired air. Their primary roles include:

• Particle filtration: They trap large airborne particles (dust, pollen, debris) before they reach the deeper respiratory tract. Computational studies have shown that nasal hairs can enhance micro-particle filtration efficiency by 12–38%, depending on their morphological configuration (number, length, and density).

• Airflow modulation: Vibrissae influence local airflow patterns in the anterior nasal airway, enhancing swirling flows in the nasal valve region. However, they also increase nasal resistance by approximately 20–80%, which can affect breathing comfort.

• Sensory function: The nasal vestibule, including the vibrissae, contains receptors capable of sensing noxious stimuli and airflow.