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Two Major Subdivisions of the Nervous System
The nervous system is structurally divided into two major subdivisions: the central nervous system (CNS) and the peripheral nervous system (PNS). Visual illustrations typically distinguish these two by depicting the brain and spinal cord for the CNS, and the extensive network of connecting nerves throughout the body for the PNS.
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Comparison of the Central and Peripheral Nervous Systems
A person accidentally touches a hot surface and immediately pulls their hand away. This reflex action involves sensory information traveling to the spinal cord, which then sends a command back to the muscles in the arm. How does this scenario illustrate the distinct functions of the two major subdivisions of the nervous system?
Central Nervous System (CNS)
Peripheral Nervous System (PNS)