|Nerve: Postganglionic autonomic fibers|
|Sympathetic connections of the ciliary and superior cervical ganglia.|
- Main article: Autonomic ganglia
They are located within the sympathetic chain ganglia or in collateral ganglia outside of the sympathetic trunk.
The neurotransmitters used for postganglionic fibers differ:
- In the parasympathetic division, they are cholinergic (that is, they use acetylcholine as their neurotransmitters.)
- In the sympathetic division, most are adrenergic (that is, they use norepinephrine as their neurotransmitters.) One exception of this is the sympathetic innervation of sweat glands, which uses acetylcholine as a neurotransmitter, at both pre and post ganglionic synapses.