Olfaction (CN I)

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Can the patient smell coffee or soap with each nostril? Do not use noxious odors, since they may stimulate pain fibers from CN V. CN I is often not tested unless specific pathology such as a subfrontal brain tumor is suspected.

24. Olfaction


What is Being Tested?

Impairment can be due to nasal obstruction, damage to the olfactory nerves in the nasal mucosa, damage to the nerves as they cross the cribriform plate, or intracranial lesions affecting the olfactory bulbs.