Glial cells are super important for helping brain cells, called neurons, work well and stay healthy.

In fact, there are about three times as many glial cells as neurons! Some estimates say there are around 86 billion neurons and about 100 to 200 billion glial cells.

Here are the key types of glial cells:

1. Astrocytes:

   • They help form the blood-brain barrier. This barrier controls what nutrients get to the brain.
   • Astrocytes also work with neurons to balance the ions around them and get rid of extra neurotransmitters, which are chemicals that help send signals between neurons.

2. Oligodendrocytes:

   • These cells create myelin sheaths. Myelin sheaths wrap around neurons and help signals travel way faster—up to 100 times quicker!

3. Microglia:

   • Microglia are like the brain's immune cells. They make up about 10 to 15 percent of all glial cells.
   • Their main job is to clear away debris and dead neurons. This is very important for keeping the brain healthy.

To sum it up, glial cells are essential. They provide support, supply nutrients, and offer protection, making sure neurons work properly and keeping the whole brain healthy.