Nasal Hair Function: Filtering Particles, Not Trapping Water Vapor
Nasal hairs (vibrissae) are the first line of respiratory defense.
Primary Function
- Mechanical filtration of large particles (>10 µm): dust, pollen, sand, insects.
- Reduce inspiratory flow turbulence, promoting laminar flow.
- Trigger sneeze reflex via trigeminal nerve when stimulated.
What They Do NOT Do
- Trap water vapor. Humidification is performed by the richly vascularized nasal mucosa (turbinates) covered in mucus blanket.
- Filter viruses/bacteria directly (too small); mucus and cilia handle sub‑micron particles.
Mucociliary Clearance
Ciliated pseudostratified epithelium moves mucus blanket (with trapped particles) posteriorly → swallowed or expectorated. Ciliary beat frequency ~1000 strokes/min.
Clinical Note
- Over‑trimming vibrissae increases particulate inhalation; trim only visible tips if cosmetic concern.
- Nasal vestibulitis (folliculitis) from plucking → treat with topical mupirocin.
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