Scientists used to think odors directly activate the trigeminal nerve - which responds to touch, temperature and painful stimulation in the head, and extends to the nose. New research suggests that specialized chemosensory cells lining the nasal cavity first detect smells and pass the news to the trigeminal nerve, alerting the brain.
Having these special sensory cells as a medium might make our noses sensitive to a variety of odors which helps us avoid bad stuff.
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