T-cells present in vessels separate from arteries and veins confirm that the brain does in fact have a lymphatic system linking it directly the peripheral immune system. When the ancient Egyptians prepared a mummy they would scoop out the brain through the nostrils and throw it away.
from My Pocket http://www.scientificamerican.com/editorial-tools/editors-picks/important-link-between-the-brain-and-immune-system-found/
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