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The parasympathetic nervous system (usually abbreviated PSNS, not PNS, to avoid confusion with the peripheral nervous system [PNS]) is one of the two divisions of the autonomic nervous system, the other being the sympathetic nervous system.
The parasympathetic and sympathetic nervous systems, along with the enteric nervous system make up the ANS. What is the parasympathetic nervous system? The parasympathetic nervous system is part of the autonomic nervous system. It originates in the spinal cord and the medulla and controls homeostasis, or the maintenance of the body's systems. The parasympathetic nervous system controls the rest and digest functions of the body. What is the sympathetic nervous system? The sympathetic nervous system, also part of the autonomic nervous system, originates in the spinal cord; specifically in the thoracic and lumbar regions. It controls the body's fight or flight responses, or how the body reacts to perceived danger. Sympathetic vs Parasympathetic Responses