The parasympathetic nervous system pns controls homeostasis and the body at rest and is responsible for the bodys rest and digest function the sympathetic nervous system sns controls the bodys responses to a perceived threat and is responsible for the fight or flight response the pns and sns are part of the autonomic nervous system ans which is responsible for the involuntary . The parasympathetic nervous system psns is one of the two divisions of the autonomic nervous system a division of the peripheral nervous system pns the other being the sympathetic nervous system. Video the sympathetic and parasympathetic nervous systems in this lesson youll learn about two subdivisions of the autonomic nervous system the sympathetic and parasympathetic nervous systems. Here is a summary of some of the effects of sympathetic and parasympathetic stimulation notice that effects are generally in opposition to each other autonomic nervous system structure rather the autonomic nervous system acts to maintain normal internal functions and works with the somatic nervous system. The autonomic nerve pathways from the control centers in the central nervous system to the target organs are composed of 2 neurons which meet and synapse in an autonomic ganglion
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