In zoology, a group of mollusks (like squid and octopuses) characterized by nerve fibers that run directly from the brain to the muscles without ganglia.
From Greek eu- 'well' plus neuron 'nerve,' referring to 'straightforward' or 'direct' nerve arrangements. This is a technical zoological classification for advanced cephalopod mollusks.
Octopuses and squid are 'euthyneurans'—their brains are directly wired to their arms with no intermediate nerve relay stations, which is why they're so smart and can change color instantly in ways jellyfish can't.
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