Organization of the vertebrate nervous systemCentral nervous system (CNS)(中樞神經系統)BrainSpinal cord (脊索神經)Peripheral nervous system (PNS)(末梢神經系統)Nerve fibers extending to other parts of the bodyAfferent(傳入) division -- carries information from sensors to CNSEfferent(輸出) division -- transmits instructions from CNS to effector organs