Roughly speaking, there are 85 billion neurons in a typical adult brain. But there are also another 86 billion cells that are not neurons. The most important class of non-neuronal cells are neuroglial cells. And without them, you simply wouldn’t be able to function. In fact, you wouldn’t be you at all. There are three major types of glial cells in the brain: oligodendrocytes, microglia, and astrocytes.
