ganglion


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ganglion:

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.
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Ganglion

 

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.

IU. I. DENISOV-NIKOL’SKII

ganglion

[′gaŋ·glē·ən]
(neuroscience)
A group of nerve cell bodies, usually located outside the brain and spinal cord.

ganglion

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 ?
12] However, reports of earlier studies about the differences in the number of ganglion cells and thickness of longitudinal layer in the colon and rectum are not consistent.
Volar ganglion cysts may cause pain or paraesthesia from compression of the ulnar or median nerves or their branches, while dorsal ganglion cysts may compress the terminal branches of the posterior interosseous nerve.
Intra-articular ganglion cysts of the knee do not have specific symptoms and the symptoms depend on their size and location within the knee joint (7-13).
Histologically, ganglioneuroblastoma is composed of neuroblasts (undifferentiated precursor cells) and ganglion (differentiated mature cells), as observed in this case, and the presence of these cell types is a diagnostic criterion for ganglioneuroblastoma (MATTIX et al.
National Eye Institute post-doctoral fellow, Dr Ben Mead, explained to OT that the loss of retinal ganglion cells (RGC) was the leading cause of irreversible blindness.
I've been in practice for multiple decades, including two years as a foot and ankle surgery resident, and I have never seen a ganglion on the ligament in the arch.
In a rat glaucoma model, the researchers studied the effects of exosomes isolated from bone marrow stem cells on retinal ganglion cells.
1) On the other hand, a purely intraneural ganglion without connection between the ganglion and the superior tibiofibular joint has been reported.
KEY WORDS: Ganglion cyst, Peroneal nerve palsy, Foot drop.
11] The prominence of the nucleolus of dorsal root ganglion cell bodies presumably reflects a high requirement for ribosomal gene transcription, ribosome production, and protein synthesis to maintain their large cell bodies and extensive axonal projections.
To improve the results of treatment, aspiration is combined with steroid injection into the ganglion wall.
But because the eye is naturally exposed to light, it's the perfect venue for a trial like this one, which seeks to switch the photoreceptive burden from the compromised rods and cones to ganglion cells deeper in the retina.