A neurode is a type of artificial neuron, capable of processing information. Bio-neural gel packs in a bio-neural circuitry system used neurodes.
In 2373, a Tak Takian macrovirus infected a bio-neural gel pack aboard the USS Voyager. When Lieutenant B'Elanna Torres investigated, she'd found the infection had burnt out half of the pack's neurodes, resulting in additional system malfunctions. (VOY: "Macrocosm")
In 2374, a nebula caused neurodes in a series of gel packs aboard Voyager to discharge in random bursts, producing false sensor readings. (VOY: "One")