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ganglion

Line breaks: gan|glion
Pronunciation: /ˈɡaŋɡlɪən
 
/

Definition of ganglion in English:

noun (plural ganglia /-lɪə/ 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 fibre.
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 centre in the nervous system of an invertebrate.
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 grey matter within the central nervous system. See also basal ganglia.
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.
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.

Origin

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

Derivatives

ganglionic

1
Pronunciation: /-ˈɒnɪk/
adjective
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.

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