Olfactory nerve: The olfactory nerve is the first cranial nerve, although this categorization is disputed since it is an extension of the central nervous system. Its role, solely sensory, is to convey the sense of smell. It derives from the embryonic nasal placode and is made up of olfactory receptor neurons. In humans, the olfactory nerve originates at the level of the olfactory mucosa in the anterosuperior part of the nasal cavity. It crosses the cribriform plate of the eth...
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