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colleen colleen
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11 years ago
Many axons, especially the larger ones, are insulated with a myelin sheath. Write an essay on the importance of the myelin sheath, making sure to incorporate the following information:
•   What kind of cells makes up the myelin sheath?
•   What does the myelin sheath look like?
•   What are two purposes of the myelin sheath?
•   What happens when a person experiences the loss of myelin?
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11 years ago
Myelin is a fatty sheath formed by glial cells.
It occurs in segments along the axon and looks like a string of link sausages.
Function 1—to prevent signals in adjacent cells from interfering with each other.
Function 2—to speed up conduction of neural impulses.
Loss of myelin causes erratic nerve signals resulting in things like loss of sensation, muscle weakness or paralysis, lack of coordination, or vision problems.
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