tens of thousands of synapses 100 trillion. 0.15 quadrillion connections 0.15 quadrillion connections tens of thousands of synapses create trillions 0.15 quadrillion connections tens of thousands of synapses create trillions 0.15 quadrillion connections 人間の脳 0.15 quadrillion connections 0.15 quadrillion connections tens of thousands of synapses http://www.dana.org/News/Details.aspx?id=43512 in the human brain