Multiple Sclerosis 's Immune System Essay examples

773 Words May 17th, 2015 4 Pages
Multiple Sclerosis - Kellie McThenia

Multiple Sclerosis involves an immune-mediated process in which an abnormal response of the body 's immune system is directed against the central nervous system. Within the central nervous system or CNS, the myelin sheath (fatty substance that surrounds the nerve fibers) is attacked by the immune system. This forms scar tissue, or sclerosis (scler/o meaning hard, -osis meaning abnormal condition or disease). The damaged or destroyed myelin sheath or nerve fibers results in interrupted nerve impulses to the brain, which leads to a variety of symptoms that will be discussed later in this paper. There are four types of Multiple Sclerosis: Relapsing-remitting MS (RRMS), secondary-progressive MS (SPMS), primary-progressive MS (PPMS), and progressive-relapsing MS (PRMS). Relapsing-remitting MS affects about 85% of those with MS, and is characterized by clearly defined attacks of worsening neurologic function. The attacks are followed by partial or complete recovery periods. Secondary-progressive MS follows after the relapsing-remitting course, and most people diagnosed with RRMS will transition to SPMS. Primary-progressive MS is steadily worsening neurologic function from the beginning. About 10% of people with MS are diagnosed with PPMS. Progressive-relapsing MS is the least common and is characterized by steadily progressing disease from the beginning and occasional exacerbations. Although the etiology of MS is still unknown, there are…

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