At birth, the human brain contains its own immune cells called microglia that are thought to persist throughout life without being replaced by cells from outside the brain.
Sources
- Anatomy articles within Nature (nature.com)
- https://www.nih.gov/news-events/nih-research-matters/immune-cells-cross-blood-brain-barrier-during-human-aging (nih.gov)
- https://brainresilience.stanford.edu/news/aging-brains-welcome-reinforcements-outside-immune-cells (brainresilience.stanford.edu)
- https://pmc.ncbi.nlm.nih.gov/articles/PMC4526747/ (pmc.ncbi.nlm.nih.gov)
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