Cranial nerve I is known as the olfactory nerve, originating in olfactory cells and terminating in the olfactory bulb.
Cranial nerve I is classified as a special sensory nerve.
Smell is the main function of cranial nerve I, and it is the only cranial nerve with no thalamic relay to the cortex. Olfactory receptor neurons within the olfactory nerve extend axons to the olfactory bulb. These G-protein coupled receptors are located within the upper nasal cavity and can detect thousands of different odorants.
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