ganglion


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]

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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).

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      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.

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Universalium. 2010.

Look at other dictionaries:

  • ganglion — [ gɑ̃glijɔ̃ ] n. m. • XVIe; bas lat. ganglion, gr. gagglion ♦ Petit renflement sur le trajet des vaisseaux lymphatiques et de certains nerfs. Ganglion lymphatique. ⇒fam. glande. Ganglion nerveux. Ganglion sympathique, parasympathique. Ganglions… …   Encyclopédie Universelle

  • ganglion — GANGLIÓN, ganglioni, s.m. Formaţie anatomică de formă sferică sau alungită, alcătuită dintr o masă de celule şi situată pe traiectul unui nerv sau al unui vas limfatic; momiţă1. [pr.: gli on] – Din fr. ganglion. Trimis de gall, 13.09.2007. Sursa …   Dicționar Român

  • 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 — (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 — Sn einfache Nervenbahn per. Wortschatz fach. (17. Jh., Form 19. Jh.) Entlehnung. Zunächst entlehnt aus l. ganglium, dann an dessen Vorbild gr. gagglíon Geschwulst angepaßt. Der Plural ist eingedeutscht (Ganglien).    Ebenso ne. ganglion, nfrz.… …   Etymologisches Wörterbuch der deutschen sprache

  • ganglion — (n.) 1680s, from Gk. ganglion tumor, used by Galen for nerve bundle. Of unknown origin; according to Galen, the proper sense of the word was anything gathered into a ball …   Etymology dictionary

  • ganglion — ganglìōn m <G ganglióna> DEFINICIJA pat. mala cistična oteklina, tumoru slična tvorba, ob. na šaci ETIMOLOGIJA lat. ← grč. ganglíon …   Hrvatski jezični portal

  • ganglion — [gaŋ′glē ən, gaŋ′glēän΄] n. pl. ganglia [gaŋ′glēə] or ganglions [special use of LL ganglion, a swelling < Gr, tumor, prob. redupl. < IE base * gel , to form into a ball > CLING, CLOD] 1. a mass of nerve cells serving as a center from… …   English World dictionary

  • Ganglĭon — (gr.), 1) (Anat.), s. Ganglien; 2) (Chir., Überbein), kleine, erbsen bis wallnußgroße Geschwülste, bestehend in wassersüchtiger Austreibung der unter den Muskelsehnen liegenden Schleimbeutel, s.d …   Pierer's Universal-Lexikon

  • Ganglĭon — (griech.), Knoten, Nervenknoten (s. Ganglien), auch Überbein. G. Gasseri, s. Gehirn …   Meyers Großes Konversations-Lexikon

  • Ganglion — Ganglĭon (grch.), Ganglienknoten; auch Überbein (s.d.) …   Kleines Konversations-Lexikon


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