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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.

Two Major Subdivisions of the Nervous System

The nervous system is broadly divided into two main parts. The Central Nervous System (CNS) consists of the brain and spinal cord, serving as the primary control center. In contrast, the Peripheral Nervous System (PNS) is composed of all the nerves that branch out from the CNS, connecting it to the rest of the body, including limbs and organs.

Comparison of the Central and Peripheral Nervous Systems

Comprising the brain and the spinal cord, the Central Nervous System (CNS) serves as a primary division of the broader nervous system. Anatomical illustrations highlight its centralized location within the human body.

Central Nervous System (CNS)

The Peripheral Nervous System (PNS) is a major division of the nervous system consisting of nerves located in the periphery of the body, which includes everything outside the central nervous system (CNS). These thick bundles of axons carry messages back and forth between the CNS and the body's muscles, organs, and senses.

Peripheral Nervous System (PNS)

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?

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