Inflammation of a small bundle or cluster of nerve or muscle fibers called a fasciculus.
From Latin fasciculus (small bundle) + -itis (inflammation). The term emerged in medical terminology in the 19th century to describe inflammatory conditions affecting organized fiber groups in the body.
Your body is basically made of bundles within bundles—muscles contain fascicles, which contain fibers, which contain myofibrils. When doctors add '-itis' to fasciculus, they're describing inflammation at a very specific architectural level of your tissues.
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