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The olfactory nerve (Latin: nervus olfactorius) is typically considered the first cranial nerve, or simply CN I. It contains the afferent nerve fibers of the olfactory receptor neurons, transmitting nerve impulses about odors to the central nervous system, where they are perceived by the sense of smell (olfaction).
1 CN I, the olfactory nerve, carries information regarding smell from the nose to the brain. 2  Loss of the sense of smell may indicate damage to CN I, such as from a tumor, known as an olfactory groove meningioma, according to Mayfield. 3  CN II, the optic nerve, carries visual information to the brain for processing.