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Did you know that the brain makes up nearly 2% of your body weight? Or that there are about 100 billion neurons in your brain - about the same as the number of stars in the Milky Way?
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The nervous system is very quick, it can transmit impulses at a tremendous speed of 100 meters per second. The speed of message transmission to the brain can be as high as 180 miles per hour.
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The human spinal chord consists of around 13,500,000 neurons. The cluster of nerves located at the base of the spinal chord are most sensitive.
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There are 43 different pairs nerves which connect the central nervous system to every part of our body. Twelve of these nerve pairs are connected to the brain, while the remaining 31 are connected to the spinal chord.