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sheath
(redirected from myelin sheath)

   Also found in: Dictionary/thesaurus, Medical, Encyclopedia, Wikipedia 0.01 sec.
See: cover, protection


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MS, a chronic disease of the nervous system, affects the brain and spinal cord by damaging the myelin sheath, which surrounds and protects nerve cells.
Myelin sheaths are composed mostly of fats; they insulate the nerves and preserve the speed of electrical transmissions.
In certain spinal cord injuries, the axons are severed and the myelin sheath damaged, resulting in an inability to feel or sense the body.
 
 
 
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