Noun
nerve net (plural nerve nets)
(biology) Simplistic and uncentralized nervous system of cnidarians.
Cnidarians' activities are coordinated by a decentralized nerve net and simple receptors. Source: Internet
In most jellyfish the nerve net is spread more or less evenly across the body; in comb jellies it is concentrated near the mouth. Source: Internet
Hydra generally react in the same way regardless of the direction of the stimulus, and this may be due to the simplicity of the nerve net. Source: Internet