神經系統（粵拼：san4 ging1 hai6 tung2；英文：nervous system）係動物身上，通過傳遞神經信號控制同協調身唔同部位嘅系統。最主要嘅特徵係有叫做神經元嘅細胞，識得用電子化學信號好快咁傳遞到其他細胞。[1]
有脊動物包括人類嘅神經系統分為中央神經系統同埋周邊神經系統。中央神經系統包括腦同脊髓。週邊神經系統又可以分做軀體神經系統同自主神經系統。而自主神經系統再可以分做交感神經、副交感神經系統同腸神經系統。[1]
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