The document summarizes the nervous system of arthropods. Arthropods have a segmented nervous system composed of ganglia connected by a ventral nerve cord. Each body segment typically contains a pair of ganglia that process sensory information and control motor functions. The brain is made up of six fused ganglia in the head that control different functions - the protocerebrum controls vision, the deutocerebrum processes antenna sensory input, and the tritocerebrum connects the brain to the ventral nerve cord. Other ganglia control activities in specific body parts.