What does preganglionic mean?
Preganglionic describes the portion of an autonomic nervous-system pathway that comes before a peripheral ganglion. Preganglionic neurons have cell bodies in the brain or spinal cord and send axons toward a ganglion, where they form synapses with postganglionic neurons. The distinction helps describe how the autonomic nervous system relays commands from the central nervous system to organs, muscles, and glands. The term is also important in pharmacology because drugs may act at preganglionic synapses or affect the neurons that form them. Although the word is specialized, it expresses a precise anatomical relationship: the signal travels toward a ganglion before passing through the final, postganglionic pathway to its target.
adjectiveRelating to or constituting the part of an autonomic nerve pathway that lies between the central nervous system and a peripheral ganglion. Preganglionic neurons send their axons toward a ganglion, where they synapse with postganglionic neurons.
- Relating to or constituting a neuron or nerve fiber located between the central nervous system and a peripheral ganglion.
"Preganglionic fibers in the sympathetic nervous system originate in the spinal cord."
"Preganglionic neurons in the parasympathetic system arise from the brainstem and sacral spinal cord."
"The drug acts at preganglionic synapses in the autonomic nervous system."
Preganglionic neurons are the relay runners of the autonomic nervous system: they carry commands toward a ganglion before the final signal continues to its target.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of preganglionic
The English term combines the prefix pre-, meaning “before,” with ganglion, referring to a knot-like cluster of nerve cells, and the suffix -ic, meaning “relating to.” Its development follows the anatomical distinction between nerve fibers before and after a ganglion, with the corresponding term postganglionic referring to the later portion of the pathway.
How preganglionic is actually used
This is a specialized anatomical and physiological term, used mainly in discussions of the autonomic nervous system, neuroanatomy, and pharmacology.
Easily confused with preganglionic
Preganglionic neurons carry signals toward a peripheral ganglion, whereas postganglionic neurons carry signals from that ganglion to organs, muscles, or glands.