Glia are specialized cells of the nervous system whose main function is to "glue" neurons together. Specialized glia called Schwann cells secrete myelin sheaths[?] around particularly long axons. Glia of the various types greatly outnumber the actual neurons.
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... 21, 1558) was Holy Roman Emperor (as Charles V) from 1519-1558; he was also King of Spain from 1516-1556 -- officially as Charles I of Spain, although often referred to as ...