part_of part of part of extends_fibers_into central nervous system autonomic ganglion trigeminal nerve fibers nerve fiber preganglionic autonomic fiber MESH:D001339 uberon FMA:5923 preganglionic autonomic fibre preganglionic nerve fiber Wikipedia:Preganglionic_nerve_fibers NCIT:C12624 Nerve fibers which project from the central nervous system to autonomic ganglia. In the sympathetic division most preganglionic fibers originate with neurons in the intermediolateral column of the spinal cord, exit via ventral roots from upper thoracic through lower lumbar segments, and project to the paravertebral ganglia; there they either terminate in synapses or continue through the splanchnic nerves to the prevertebral ganglia. In the parasympathetic division the fibers originate in neurons of the brain stem and sacral spinal cord. In both divisions the principal transmitter is acetylcholine but peptide cotransmitters may also be released. UBERON:0011925 autonomic nerve