preganglionisilta
The term *preganglionic* refers to the first neuron in the autonomic nervous system, which transmits signals from the central nervous system (CNS) to an autonomic ganglion. In the context of autonomic innervation, these neurons originate in the brainstem or spinal cord and project to peripheral ganglia, where they synapse with postganglionic neurons. The term *preganglionic* is often paired with *sympathetic* or *parasympathetic* to specify the division of the autonomic nervous system involved.
In the sympathetic division, preganglionic neurons emerge from the thoracolumbar region of the spinal cord (T1–L2),
In contrast, the parasympathetic division features preganglionic neurons originating in the brainstem (cranial nerves III, VII,
The length of preganglionic fibers varies between divisions: sympathetic preganglionic fibers are relatively short, while parasympathetic