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CN I

Number (1) Brainstem Foam-finger

Picmonic

Cranial nerve I is a special sensory nerve that is responsible for smell. It travels through the olfactory tract and bulb and exits through the foramina in the cribiform plate of the ethmoid bone.

3 KEY FACTS

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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