Definition of ganglion in English:


Syllabification: gan·gli·on
Pronunciation: /ˈgaNGglēən

noun (plural ganglia /-glēə/ or ganglions)

  • 1 Anatomy A structure containing a number of nerve cell bodies, typically linked by synapses, and often forming a swelling on a nerve fiber.
    More example sentences
    • The two major plexuses consist of ganglia, clusters of nerve cell bodies disposed at more or less regular intervals over the surface of the cylinder.
    • This nerve carries the otic ganglion, which is derived from glossopharyngeal neurons.
    • In the first form (restlessness and dysphagia), the lesions tend to concentrate in the brain stem and the cranial nerve ganglia.
  • 1.1A network of cells forming a nerve center in the nervous system of an invertebrate.
    More example sentences
    • Swim interneuron isolation was done according to methods previously described by them, by pulling the cell out of the ganglia using the recording microelectrode.
    • It appears as if all of the staining in the cerebral ganglia is due to processes emanating from cells in the ganglia at the base of the tentacles.
    • If this experiment were possible I would predict that removing the rhopalial ganglion cells would eliminate a behavioral response to light even if the eyes and the swim system remained unharmed.
  • 1.2A well-defined mass of gray matter within the central nervous system. See also basal ganglia.
    More example sentences
    • It is deposited in those brain ganglia that normally house iron.
    • Occurrence of neurodegeneration was indicated by the vacuolar appearance of neural tissues of the brain or ganglia.
    • Inflammation is commonly present in the basal ganglia, brainstem, spinal cord, and dorsal root ganglia and is composed of a perivascular lymphocytic infiltrate with accompanying glial reaction.
  • 2 Medicine An abnormal benign swelling on a tendon sheath.
    More example sentences
    • Flexor tendon sheath ganglia make up the remaining 10 to 15 percent.
    • Metastatic lesions may be confused with a ganglion, epidermoid inclusion cyst, acute gout, and even rheumatoid arthritis.
    • It is the breakdown of the synovial tissue of tendon sheaths that gives rise to most ganglia.



Pronunciation: /ˌgaNGglēˈänik/
More example sentences
  • Robo2, which we identified in the screen as a weak suppressor, has previously been shown to be required to prevent the ganglionic branches of the embryonic tracheal system from crossing the ventral midline.
  • The two main ganglionic trunks of the sympathetic nervous system are the cervical and lumbar trunks.
  • Mature neuronal or ganglionic cells were not seen.


late 17th century: from Greek ganglion 'tumor on or near sinews or tendons', used by Galen to denote the complex nerve centers.

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