Detailed scans of concussed hockey players found that the protective fatty tissue surrounding brain cell fibers was loosened two weeks after the injury -- even though the athletes felt fine and were deemed ready to return to the ice. A loosening of that insulation, called myelin, slows the transmission of electrical signals between neurons, and shows that passing a concussion test may not be a reliable indicator of whether the brain has truly healed.
from Top Health News -- ScienceDaily https://ift.tt/2wGTlBg
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