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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).
Smell is perceived through part of the roof of the nasal cavity (olfactory cleft) that is just next to the part of the brain responsible for smell (olfactory bulb and fossa). This bony partition in this area (âcribriformâ bone) is pierced by numerous nerves (âOlfactoryâ nerves) on each side.erve Supply. Sensation to the nose is provided to the nasal cavity primarily via branches of the trigeminal nerve. The ophthalmic division (V1) of the trigeminal nerve gives off the anterior and posterior ethmoidal nerves, which supply sensation to the top half of the nasal cavity and septum.