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The primary component of the central nervous system, which, along with the spinal cord, controls the body of bilaterally symmetrical beings.
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Are there organisms with fewer than 1000 neurons?
Re: insect brain size
Following article has a good summary — in short insects' nervous systems range from 7400 to 850000 neurons:
http://blogs.discovermagazine.com/notrocketscience/2011/11/30/how-fairy-wasps-cope-with-being-smaller-than-amoebas …