: The brain’s resident immune cells. They act as macrophages, scavenging for dead cells, debris, and pathogens.
: These line the brain's ventricles and help produce and circulate cerebrospinal fluid (CSF) using hair-like cilia. Peripheral Nervous System (PNS) 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