A ganglion (pl.: ganglia) is a group of neuron cell bodies in the peripheral nervous system. In the somatic nervous system, this includes dorsal root ganglia and trigeminal ganglia among a few others. In the autonomic nervous system, there are both sympathetic and parasympathetic ganglia which contain the cell bodies of postganglionic sympathetic and parasympathetic neurons respectively.
| Ganglion | |
|---|---|
 Micrograph of a ganglion. H&E stain. | |
| Details | |
| System | Nervous system |
| Identifiers | |
| Latin | ganglion |
| MeSH | D005724 |
| TA98 | A14.2.00.002 |
| FMA | 5884 |
| Anatomical terminology | |
A pseudoganglion looks like a ganglion, but only has nerve fibers and has no nerve cell bodies.
Structure
editGanglia are primarily made up 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:
- Dorsal root ganglia (also known as the spinal ganglia) contain the cell bodies of sensory (afferent) neurons.
- Cranial nerve ganglia contain the cell bodies of cranial nerve neurons.
- Autonomic ganglia contain the cell bodies of autonomic nerves.
In the autonomic nervous system, fibers from the central nervous system to the ganglia are known as preganglionic fibers, while those from the ganglia to the effector organ are called postganglionic fibers.
Basal ganglia
editThe term "ganglion" refers to the peripheral nervous system.[1]
However, in the brain (part of the central nervous system), the basal ganglia are a group of nuclei interconnected with the cerebral cortex, thalamus, and brainstem, associated with a variety of functions: motor control, cognition, emotions, and learning.[citation needed]
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.[citation needed]
Pseudoganglion
editA pseudoganglion is a localized thickening of the main part or trunk of a nerve that has the appearance of a ganglion[2] but has only nerve fibers and no nerve cell bodies.
Pseudoganglia are found in the teres minor muscle[3] and radial nerve.[citation needed]
See also
editReferences
edit- ^ "Glossary G". UNSW Embryology. Archived from the original on 14 December 2007. Retrieved 2008-01-13.
- ^ "pseudoganglion". The Free Dictionary. Retrieved 19 December 2016.
- ^ Gitlin, G. (Oct 1957). "Concerning the gangliform enlargement (pseudoganglion) on the nerve to the teres minor muscle". Journal of Anatomy. 91 (4): 466–70. PMC 1244902. PMID 13475146.
External links
edit
Media related to Ganglia at Wikimedia Commons
