EntityQ1762173· pop 9· linked from 32 articlesnerve netSign in to savesimplest form of a nervous system: neurons are found spread apart, allowing the organism to respond to its environmentConnectionsanatomical placementEntityEchinodermataEntityaxonEntityAnimaliaEntityneuronEntityCnidariaEntityCtenophoraEntitymyelinEntitysymmetry in biologyEntitysensory neuronEntityoceanEntitybrainEntityInternational Standard Book NumberEntityVertebrataEntityChordataEntitybiochemistryEntityarthropodEntitynervous systemEntityhormoneEntitylipidEntityCategoriesCnidarian anatomyEchinoderm anatomyInvertebrate nervous system