There has been another fascinating immune system
discovery. Bone
marrow, the spongy tissue inside most of our bones, produces red blood cells as
well as immune cells that help fight off infections and heal injuries. Apparently some small tunnels that
connect the bone marrow of the skull with brain tissue. These tunnels appear to
be heretofore unknown pathways that permit immune cells to travel directly from
the skull to a damaged part of brain tissue. When a disorder such as a stroke
occurs in the brain, this tunnel apparently allows immune system cells to be
sent directly to the site of injury in the brain instead of having to wait for
cells from a bone-marrow site in the body to reach brain tissue.
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