Microglia
Microglia are the brain's immune cleanup cells that constantly surveil neural tissue, clear debris, and regulate inflammation to keep the brain healthy.
Microglia are the specialized immune cells of the brain, functioning as the central nervous system's version of macrophages. They continuously surveil neural tissue, clear debris, respond to damage, and regulate inflammation to maintain brain health.
What this means in real life
When you get a minor head bump, microglia swarm to the injury site to clear damaged tissue and prevent infection—like cleanup crews arriving after an accident.
What it isn’t
Not the same as astrocytes or other brain support cells. Microglia are specifically immune cells; astrocytes provide structural and metabolic support. People often conflate all brain immune activity as one process.
Commonly misused online
Social media often claims microglia 'activation' is always harmful, but activation is normal and necessary. The problem is *chronic* or *excessive* activation, not the process itself.