Decay Of Brain’s Myelin = Physical decline

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In this cross-section of a human head, the green fibers represent myelin-sheathed axons traveling from the cortex through the brain and down the spine. (Credit: Image courtesy of UCLA)

Had Griffey been 40, it could be argued, he might not have made the throw in time. That’s because in middle age, we begin to lose myelin — the fatty sheath of “insulation” that coats our nerve axons and allows for fast signaling bursts in our brains.

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