Synapse

<p>Apr 21, 2009 7:32 PM

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The adult human brain is estimated to contain from 10¹⁴ to 5 × 10¹⁴ (100-500 trillion) synapses.

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How many synapse in a cubic mm.

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Say &#160;human brain has a quadrillion synapses = &#160;1015.

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and say the brain size is 1400 cc...

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Now divide 1015 by 1000 = &#160;1012 per cubic cm and there

are 1000 cubic mm in a cubic cm &#160;so

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there are abt &#160;109 synapses in a cubic mm &#160;now divide that by

10,000 + &#160;105 neurons per cubic mm = &#160;100,000 neurons per cubic mm.

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The figure listed in &#160;http://faculty.washington.edu/chudler/what.html

is &#160;half a billion synapses per cubic mm.

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