Glia -

: Form the myelin sheath around axons to speed up electrical signals. Oligodendrocytes work in the central nervous system (CNS), while Schwann cells are in the peripheral nervous system (PNS).

: Line the brain's ventricles and produce cerebrospinal fluid (CSF) . Key Functions: : Form the myelin sheath around axons to

: Act as the brain’s immune system, scavenging pathogens and dead cells. scavenging pathogens and dead cells.