The Brain


The brain is the body’s most complex organ.


  •  The adult human brain weighs approximately 1.4 kg (3 pounds) and contains about 100 billion neurons (nerve cells) and trillions of "support cells" called glia.
  • The brain supports more than 100-500 trillion synapses
  • The spinal cord is about 43 to 45 cm long (17-18 inches) in adult humans and weighs about 35-40 grams (1.2-1.4 ounces).
  • The backbone that houses and protects the spinal cord, is much longer than the spinal cord—about 70 cm (27 inches) long.
  • The brain is capable of between 1015 and 1019 computations per second (CPS). By comparison a modern super computer is capable of 109 CPS.

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