(ˌɔːtəˈnɒmɪk ˈsɪstəm)
noun
1. The part of the vertebrate nervous system that regulates involuntary action.
2. The system of nerves and ganglia that innervates the clood vessels, heart, smooth muscles, viscera, and glands and controls their involuntary functions, consisting of sympathic and parasympathetic portions.
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