Final answer:
The brain and spinal cord correspond to the central nervous system (CNS), while the somatic and autonomic nervous systems relate to the peripheral nervous system (PNS), each with distinct functions.
Explanation:
The brain and spinal cord are to CNS as the somatic and autonomic nervous systems are to PNS. The somatic nervous system controls voluntary movements, while the autonomic nervous system regulates involuntary functions.
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