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Unformatted text preview: feet in length. Most axons receive insulation from a layer of fatty material surrounding them called the myelin sheath. In the central nervous system this insulation is comprised of glial cells. Within the insulation small constrictions known as nodes divide it into segments. The myelin sheath provides the neuron with the ability to prevent signals in adjacent cells from interfering with each other. Also, its structure allows the conduction of neural impulses to accelerate. For these two reasons the insulation around our axon is crucial for a healthy, sustainable life. Without it erratic nerve signals can lead to loss of sensation, weakness, paralysis, lack of coordination, and weakened vision. The combination of dendrites and axons give neurons not one job, but two. More simply put, a neuron is first the catcher and then the batter....
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- Spring '08