I could never understand this until just recently. There was an article in "Science" published by the American Association for the Advancement of Science. It was an article about how the Schwann cell makes the myelin sheath that covers and protects all the nerves as they pass through your body. There are little cells every couple of centimeters that makes a covering, an insulation called myelin that protects the nerve from damage and it protects the nerve so it doesn't short circuit and lose its electric impulse when the nerve impulse comes down. Turns out that progesterone is necessary for Schwann cell to make the myelin sheath. Now who ever new that before?
Much More on Progesterone
Abstract reference: http://www.sciencemag.org/content/268/5216/1500.abstract
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