Relating to or affecting the epineurium, the outermost sheath of connective tissue that surrounds a nerve bundle.
From epi- (Greek 'upon') + neurium (from Greek neuron 'nerve' + -ium, a Latin noun suffix). This modern anatomical term emerged in the 19th century as microscopic anatomy developed.
Your nerves are wrapped in layers like a burrito, and doctors needed a word for the outermost wrapper—that's the epineurium! This term shows how scientists love precise layers and boundaries, even in places you can't see.
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