自主神經 zìzhǔshénjīng autonomic nervous system Origin Definitions Defs Strokes Stroke Words Sentences Sents 自主神经系统 zìzhǔshénjīngxìtǒng autonomic nervous system The part of the nervous system that controls involuntary functions like the internal organs, blood vessels, and glands; it is composed of the sympathetic and parasympathetic systems.