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Ganglion

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Ganglion

Micrograph of a ganglion. H&E stain.
A dorsal root ganglion (DRG) from a chicken embryo (around stage of day 7) after incubation overnight in NGF growth medium stained with anti-neurofilament antibody. Note the axons growing out of the ganglion.

In anatomy, a ganglion ( ; plural ganglia) is a nerve cell cluster[1] or a group of nerve cell bodies located in the peripheral nervous system.[2][3] Cells found in a ganglion are called ganglion cells, though this term is also sometimes used to refer specifically to retinal ganglion cells.

Neurology

In neurological contexts, ganglia are composed mainly of somata and dendritic structures which are bundled or connected. Ganglia often interconnect with other ganglia to form a complex system of ganglia known as a plexus. Ganglia provide relay points and intermediary connections between different neurological structures in the body, such as the peripheral and central nervous systems.

Among vertebrates there are three major groups of ganglia:

In the autonomic nervous system, fibers from the postganglionic fibers.

Basal ganglia

The term "ganglion" refers to the peripheral nervous system.[4]

However, in the brain (part of the central nervous system), the "basal ganglia", or basal nuclei, is a group of nuclei interconnected with the cerebral cortex, thalamus and brainstem, associated with a variety of functions: motor control, cognition, emotions, and learning.

Partly due to this ambiguity, the Terminologia Anatomica recommends using the term basal nuclei instead of basal ganglia; however, this usage has not been generally adopted.

Pseudoganglion

A pseudoganglion is a localized thickening of the main part or trunk of a nerve that has the appearance of a ganglion but has only nerve fibres and no nerve cells.[5]

Pseudoganglia are found in the teres minor muscle[6] and radial nerve.

See also

References

  1. ^ Sadava, David; Heller, H. Craig; Orians, Gordon H.; Purves, William K.; Hillis, David M. (2008). Life: The Science of Biology (8th ed.). W. H. Freeman. p. 943.  
  2. ^ "ganglion" at Dorland's Medical Dictionary
  3. ^ Brodal, Per (2010). The Central Nervous System. Oxford University Press. p. 5.  
  4. ^ "UNSW Embryology- Glossary G". Retrieved 2008-01-13. 
  5. ^ "pseudoganglion". TheFreeDictionary. Retrieved 2 February 2014. 
  6. ^ Gitlin, G. (Oct 1957). "Concerning the gangliform enlargement (pseudoganglion) on the nerve to the teres minor muscle". Journal of Anatomy 91 (4): 466–70.  
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