Answer;
-Glial cells
Step-by-step explanation;
-The glial cells surround neurons and provide support for and insulation between them. They are the most abundant cell types in the central nervous system.
The Glial cells have a primary function of holding the CNS together; plays an important role in communication between neurons, produces the material that insulates neurons (myelin), aid cell metabolism.
Additionally, they help form blood-brain barrier, play a key role in the control of breathing, regulate neuronal transmission, & may play an important role in repair after brain injury.