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brain-oldThe brain is the center of the human nervous system. The cerebral cortex of the brain contains15–33 billion neurons  linked with up to 10,000 synaptic connections. Each cubic millimeter of cerebral cortex contains around one billion synapses. Neurons communicate with one another via axons, which carry trains of signal pulses called action potentials to other parts of the brain or body and target them to specific recipient cells.

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