Fibrous tissue and glial cells (support cells) in the nervous system mixed together.
From 'fibro-' (fiber) + 'glia' (from Greek 'glia', glue, referring to support cells). Neuroanatomical term.
Glia are often called the 'glue' of the brain because they hold neurons together, and when they become fibrous and form scar tissue, it can actually change how brain signals travel—which is why brain scars affect behavior.
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