Neuroglia -

: The most abundant glial cells. They maintain the blood-brain barrier, regulate the chemical environment (like potassium ions), and provide nutrients like lactate to neurons.

: The brain’s resident immune cells. They act as macrophages, scavenging for dead cells, debris, and pathogens. neuroglia

: These line the brain's ventricles and help produce and circulate cerebrospinal fluid (CSF) using hair-like cilia. Peripheral Nervous System (PNS) : The most abundant glial cells

: Function similarly to oligodendrocytes by forming myelin sheaths around axons in the PNS, but also aid in nerve regeneration. scavenging for dead cells

: These cells produce myelin , a fatty sheath that wraps around axons to speed up electrical signals.