The Brain – Fun Facts About Human Brain

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  • The human brain is the largest brain of all vertebrates relative to body size

  • It weighs about 3.3 lbs. (1.5 kilograms)

  • The brain makes up about 2 percent of a human’s body weight

  • The cerebrum makes up 85 percent of the brain’s weight

  • It contains about 86 billion nerve cells (neurons) — the “gray matter

  • It contains billions of nerve fibers (axons and dendrites) — the “white matter

  • These neurons are connected by trillions of connections, or synapses

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