are one of two broad classes of nerve cells in the brain (the other class is the glia). According to the neuron doctrine, the neuron is the fundamental functional unit of the brain, the information-processing unit. However, recent evidence suggests that the glia, once thought to simply provide support, may also play a role in the work of the brain. There are about 100 billion neurons in the brain, but this is only about 10% of the number of brain cells.
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