Figure 68 shows the origin and function of the twelve cranial nerves:
SPINAL NERVES Some nerves are not connected at all to the brain but are instead connected to the spinal cord. This is a more regular arrangement, with a nerve exiting between each of the vertebrae. All of these nerves combine both sensation and motor function, with axons that separate into two nerve roots. The sensory component involves axons that enter the spinal cord via the dorsal nerve root, while the somatic and autonomic motor nerve leave the spinal cord as the ventral nerve root.
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