The central nervous systeM consisted of brain, suboesophageal ganglion and ventral nerve-cord, and the differentiations aMong protocerebruM, deutocerebruM and tritocerebruM were obvious.
神经系统由脑、食管下神经节、腹神经索组成，前、、后脑分化明
。
脑The central nervous systeM consisted of brain, suboesophageal ganglion and ventral nerve-cord, and the differentiations aMong protocerebruM, deutocerebruM and tritocerebruM were obvious.
神经系统由脑、食管下神经节、腹神经索组成，前、、后脑分化明。
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