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Genetic and Rare Diseases Information Center (GARD)

* This condition is not a rare disease. It is a condition about which the GARD Information Center has received a question.

Multiple sclerosis *
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Multiple sclerosis (MS) is a disorder that affects the central nervous system (CNS), specifically the brain and spinal cord.  A fatty tissue called myelin surrounds and protects the nerve fibers of the CNS.  Myelin insulates the nerves and allows them to transmit electrical impulses from the brain to other parts of the body.  In MS, myelin is lost in multiple areas, and sometimes the nerve fiber itself is damaged or broken.  When myelin or the nerve fiber is destroyed or damaged, the nerve’s ability to conduct electrical impulses to and from the brain is disrupted; therefore, nerve signals cannot be transmitted.  The disruption of the electrical impulses causes the symptoms associated with MS. [1]


References
  1. What is Multiple Sclerosis?. National MS Society Web site. August 3, 2006 Available at: http://www.nationalmssociety.org/site/PageServer?pagename=HOM_ABOUT_what_is_ms. Accessed January 7, 2008.
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