"But over the past two decades, researchers have recognized that the
entire immune system is very much a part of a functional CNS, with vital
roles in cognition, injury repair, neurodegenerative disease, and
sensory systems. Microglia pervade the CNS, including the white and gray
matter that constitute the organ’s parenchyma. Other immune cells,
including T cells, monocytes, and mast cells, reside in the brain and
spinal cord’s outer membranes, known as the meninges, and circulate in
cerebrospinal fluid (CSF)."
Immune System Maintains Brain Health
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