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The most common brain cells are neurons and non-neuron cells called glia. The average adult human brain contains approximately 100 billion neurons, and just as many—if not more—glia. Although neurons are the most famous brain cells, both neurons and glial cells are necessary for proper brain function.

SOURCE:

https://dana.org/article/cells-of-the-brain/#:~:text=The%20most%20common%20brain%20cells,necessary%20for%20proper%20brain%20function.