Your Brain by the Numbers




86 billion neurons  (8.6 x 10ˆ10)

220 miles per  hour (Speed of a neural impulse)

25 watts of power

0 pain receptors

4 millimeters is the thickness of the human cerebral cortex
 (equal to 4 credit cards stacked)

Area of cortex unfolded: 2,500 square centimeters
 (equal to a newspaper unfolded)

400 miles of capillaries
(the distance from Washington D.C. to Providence (Rhode Island State))

8 Liters is the volume of the Sperm Whale brain, nature's largest

100 thousand miles of axons 
(4 trips around the world)

10,000,000,000,000,000 (10ˆ16) calculations per second

Over 10 Trillion Synapses  (10ˆ12)
(more than the number of cells in the entire body

20% of the body's oxygen consumed

15 feet longest axon on land (Giraffe)
30 feet longest axon on water (Blue Whale)

2 million with epilepsy

4 million with Alzheimer

4 million with stroke



by Dwayne Godwin and Jorge Cham

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