Neuroglia

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

: 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. neuroglia

Neuroglia are categorized by their location in either the Central Nervous System (CNS) or the Peripheral Nervous System (PNS). Central Nervous System (CNS) : These cells produce myelin , a fatty