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fila olfactoria
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The fila olfactoria (CN 1) are seen here piercing through the cribiform plate. Bilateral loss of smell is not usually of concern. However, unilateral loss of smell may be due to serious problems such as tumors, skull fracture and nerve damage. Test the sense of smell placing substances with strong odors (coffee, peppermint, etc.) underneath each nostril individually while the contralateral nostril is kept closed.
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