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2. Cranial Nerve I

Several cranial nerves are part of the somatic nervous system. Cranial nerve I is the olfactory nerve. It is composed of special afferent fibers and conveys the sense of smell to the brain through olfactory receptor neuron axons and the olfactory bulb. This nerve can be severed by traumatic injuries, most commonly from whiplash; trauma can lead to anosmia or the loss of smell.

olfactory nerve smell Randy Faris / Getty Images
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