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navigate by keyword : 100 americas are bestlogodesign billion biological birds body brain cach called communicate complex connections constitute cord design eye family human largest length logo logodesign made measuring more most native nerves one online organs professionallogodesign rest rmst smallest species spinal stem synapses than that they trillions trochilidae vector

The brain is one of the largest and most complex organs in the human body. It is made up of more than 100 billion nerves that communicate in trillions of connections called synapses. ... The brain stem is between the spinal cord and the rest of the brain.