The only adrenergic fibers in the autonomic nervous system are the postganglionic fibers of the parasympathetic nervous system.

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Adrenergic fibers are nerve fibers that release the neurotransmitter epinephrine (adrenaline) or norepinephrine (noradrenaline). These fibers are present in the sympathetic nervous system, which is responsible for the body's fight or flight response. The postganglionic fibers of the sympathetic nervous system are primarily adrenergic, while postganglionic fibers of the parasympathetic nervous system are cholinergic (release the neurotransmitter acetylcholine).

The Only Adrenergic Fibers in the Autonomic Nervous System Are