The bundles of axons in the body that travel together through the body are known as the nervous system.
In the central nervous system, an axon group is referred to as a tract, while in the peripheral nervous system, it is referred to as a nerve.
The central nervous system receives and transmits information along the axons found inside a neuron. a layer of connective tissue where many axons share a few blood vessels.
In the PNS, nerves are made up of axon clusters. The classification of nerves for signals leaving the CNS and traveling to the PNS, respectively, is sensory (afferent) or motor (efferent).
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