(redirected from ganglions)
Also found in: Dictionary, Thesaurus, Medical.
Related to ganglions: Ganglion cyst


see nervous systemnervous system,
network of specialized tissue that controls actions and reactions of the body and its adjustment to the environment. Virtually all members of the animal kingdom have at least a rudimentary nervous system.
..... Click the link for more information.



an anatomically isolated cluster of nerve cells (neurons), nerve fibers, and tissues, found in many invertebrates, all vertebrates, and man. In vertebrates, ganglia are located along the nerve stems.

Intervertebral ganglia, ganglia near the vertebrae, prevertebral ganglia, and ganglia enclosed in the thickness of the walls of the internal organs are topographically distinguished from each other. The intervertebral ganglia and similar ganglia are made up of sensory pseudo-unipolar neurons. Other ganglia are part of the peripheral sector of the autonomous nervous system and are mainly clusters of effector multipolar autonomous neurons, including sensory and association neurons. The clusters of neurons in each ganglion are surrounded by a layer of satellite cells, outside of which there is a thin capsule of connective tissue. Between the groups of neurons there are thicker connective tissue layers forming the connective tissue base, or stroma, of the ganglion. On the outside the ganglion is covered by a fibrous capsule, from which blood vessels reach the ganglion by way of the connective tissue layers. The synapses (nerve fibers that form the end, or terminal, contacts) lead to the bodies and branches of the autonomic neurons. In invertebrates, the ganglia arecoordinating centers carrying out the functions of a central nervous system. By means of reciprocal connections the ganglia in invertebrates form a single system that corresponds in its arrangement to the overall structure of their bodies.



A group of nerve cell bodies, usually located outside the brain and spinal cord.


1. an encapsulated collection of nerve-cell bodies, usually located outside the brain and spinal cord
2. a cystic tumour on a tendon sheath or joint capsule
References in periodicals archive ?
A ganglion cyst at the elbow causing superficial radial nerve compression: A case report.
Arthroscopic excision of a ganglion cyst from the elbow.
CT Guided Aspiration of a ganglion cyst of the anterior cruciate ligament: A Case Report.
The optic ganglion of Eriocheir sinensis consists of 4 parts: the lamina ganglionaris, medulla externa, medulla interna, and medulla terminalis.
2002), as well as the optic ganglion, thoracic ganglion, and brain ganglion in Scylla paramamosain (Song et al.
The optic ganglion, thoracic ganglion, and brain ganglion have been identified as important neuroendocrine organs in crustaceans, and some hormones excreted from these neuroendocrine organs play an important role in the regulation of gonadal maturation (Mazurova et al.
Next, the scientists used highly detailed microscopes (called electron microscopes) to analyze the ganglion in fine detail.
Not all experts are convinced that the Grueneberg ganglion detects alarm pheromones, or that there is even such a thing as an alarm pheromone.
Digerleri ise enfeksiyon hastaliklari (toksoplazma, sitomegalovirus, herpes simplex, abse olusumu, tuberkuloz gibi), vaskuler (arterioskleroz, Sturge-Weber hastaligi gibi), endokrin (hiperparatiroidizm, psodohipoparatiroidizm, idiopatik bazal ganglion kalsifikasyonu, gibi), D hipervitaminozu, subdural hematomdur (14).
Idiopatik bilateral bazal ganglion kalsifikasyonu olan ve agirlikli olarak psikiyatrik belirtilerle giden olgulara bakildiginda; bir olguda eyleme dokme ataklari, konsantrasyonda gucluk ve hafif provokasyonla siddete egilim epizodlari gosterilmistir (18).