You can mark you interesting snippets of text that will be available through a unique link in your browser.


ganglion

Translation
ganglion
—ganglial, gangliar, adj.
/gang"glee euhn/, n., pl. ganglia /-glee euh/, ganglions.
1. Anat.
a. a mass of nerve tissue existing outside the central nervous system.
b. any of certain masses of gray matter in the brain, as the basal ganglia.
2. Pathol. a cyst or enlargement in connection with the sheath of a tendon, usually at the wrist.
3. a center of intellectual or industrial force, activity, etc.
[1675-85; < LL: a type of swelling < Gk gánglion a tumor under the skin, on or near a tendon]

* * *

Aggregate of nerve-cell bodies outside the central nervous system (CNS).

The spinal ganglion contains the nerve-cell bodies of the nerve fibres that carry impulses toward the CNS (afferent neurons in dorsal root ganglia) or away from it (efferent neurons in ventral root ganglia).

* * *

      dense group of nerve-cell bodies present in most animals above the level of cnidarians (cnidarian). In flatworms (flatworm) (e.g., planaria (planarian)) two lateral neuronal cords carry impulses to and from a pair of ganglia at the head of the animal. In more advanced organisms, such as earthworms (earthworm) and arthropods (arthropod), pairs of ganglia at intervals along the body largely control the actions of each body segment, as well as a larger pair in the head. This latter pair of ganglia, considered the brain in these more advanced invertebrates, inhibits responses rather than directing them. In vertebrates the ganglion is a cluster of neural bodies outside the central nervous system. A spinal ganglion, for instance, is a cluster of nerve bodies positioned along the spinal cord at the dorsal and ventral roots of a spinal nerve. The dorsal root ganglia contain the cell bodies of afferent nerve fibres (those carrying impulses toward the central nervous system); efferent neurons (carrying motor impulses away from the central nervous system) are present in the ventral root ganglia.

* * *


Universalium. 2010.

  
Share  

Look at other dictionaries:

  • Ganglion — Gan gli*on, n.; pl. L. {Ganglia}, E. {Ganglions}. [L. ganglion a sort of swelling or excrescence, a tumor under the skin, Gr. ?: cf. F. ganglion.] 1. (Anat.) (a) A mass or knot of nervous matter, including nerve cells, usually forming an… …   The Collaborative International Dictionary of English

  • ganglion — noun; pl. lia 1) anat. ганглий, нервный узел 2) центр (дея тельности, интересов) …   Англо-русский словарь Мюллера

  • ganglion — 1> анат. нервный узел, (нервный) ганглий 2> центр, средоточие 3> мед. ганглий, кистозное образование …   Новый большой англо-русский словарь

  • Ganglion — (gr. γάγγλιον gágglion „Geschwulst“, „knotenartig“) steht für: ein von einer Kapsel umschlossener Nervenzellknoten, siehe Ganglion (Nervensystem) eine gutartige Geschwulst an Gelenkkapseln oder Sehnen, siehe Ganglion (Überbein) eine ähnliche,… …   Deutsch Wikipedia

  • ganglion — ganglion, iī, n. (γάγγλιον), eine Art von Geschwulst, ein Überbein, Veget. mul. 2, 30 (Cels. 7, 6 griechisch) …   Ausführliches lateinisch-deutsches Handwörterbuch

  • Ganglion — In anatomy, a ganglion (pl. ganglia ) is a tissue mass. [DorlandsDict|four/000043442|ganglion] NeurologyIn neurological contexts, ganglia are composed mainly of somata and dendritic structures that often interconnect with other ganglia to form a… …   Wikipedia

  • Ganglion — The celebrated 2nd century Greek physician Galen ((c. 130 201 A.D.) who lived and worked in Rome first used the word ganglion to denote a nerve complex. Ganglion still is used to refer to an aggregation of nerve cell bodies. Another use of the… …   Medical dictionary

  • Ganglion — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Sur les autres projets Wikimedia : « Ganglion », sur le Wiktionnaire (dictionnaire universel) En anatomie, un ganglion peut désigner  …   Wikipédia en Français

  • ganglion — noun (plural ganglia; also glions) Etymology: Late Latin, from Greek Date: circa 1681 1. a small cystic tumor connected either with a joint membrane or tendon sheath 2. a. a mass of nerve tissue containing cell bodies of neurons external to the… …   New Collegiate Dictionary

  • ganglion — ˈɡæŋɡlɪən (анатомия) нервный узел, (нервный) ганглий центр, средоточие (медицина) ганглий, кистозное образование ganglion (pl lia) анат. ганглий, нервный узел центр (деятельности, интересов) …   Большой англо-русский и русско-английский словарь