Neurons and Signals · Brain
Glial cells support, insulate, feed and defend the neurons.
Roughly half the cells in your brain aren't neurons at all. They're glial cells — and for most of neuroscience's history they were dismissed as packing material.
They are nothing of the sort. Some make the myelin. Some feed neurons and control the chemical environment around synapses. Some act as the brain's immune cells, clearing debris and pruning connections that aren't being used — which makes them active participants in how a brain gets shaped.
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