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Muscle is a very specialized tissue that has both the ability to contract and the ability to conduct electrical impulses. Based on functionally as either voluntary or involuntary and structurally as either striated or smooth, muscles can be classified into three types: smooth (smooth involuntary) muscle, skeletal (striated voluntary) muscle and cardiac (striated involuntary) muscle.
That white stuff is myelin, a fatty tissue that covers much of the long axons that extend out of our neurons. Scientists have found that myelination increases the speed and strength of the nerve impulses by forcing the electrical charge to jump across the myelin sheath to the next open spot on the axon. In other words, myelin turns the electrical signal into the brain version of Nightcrawler, the teleporting X-Man.