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Titolo:
Spinocerebellar projections in the pigeon with special reference to the neck region of the body
Autore:
Necker, R;
Indirizzi:
Ruhr Univ Bochum, Inst Tierphysiol, D-44780 Bochum, Germany Ruhr Univ Bochum Bochum Germany D-44780 physiol, D-44780 Bochum, Germany
Titolo Testata:
JOURNAL OF COMPARATIVE NEUROLOGY
fascicolo: 3, volume: 429, anno: 2001,
pagine: 403 - 418
SICI:
0021-9967(20010115)429:3<403:SPITPW>2.0.ZU;2-U
Fonte:
ISI
Lingua:
RUS
Soggetto:
CENTRAL CERVICAL NUCLEUS; WHEAT-GERM AGGLUTININ; PRIMARY AFFERENT INPUT; SPINAL DORSAL HORN; HORSERADISH-PEROXIDASE; ANTEROGRADE TRANSPORT; RETROGRADE TRANSPORT; POSTERIOR CEREBELLUM; VESTIBULAR NUCLEUS; CUNEATE NUCLEI;
Keywords:
spinal cord; cerebellum; vestibular nuclei;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Necker, R Ruhr Univ Bochum, Inst Tierphysiol, D-44780 Bochum, Germany RuhrUniv Bochum Bochum Germany D-44780 -44780 Bochum, Germany
Citazione:
R. Necker, "Spinocerebellar projections in the pigeon with special reference to the neck region of the body", J COMP NEUR, 429(3), 2001, pp. 403-418

Abstract

Neck sensory information is important for control of head and body movements in all vertebrates. Neuroanatomic tracing methods were used to study thepathways of neck efferent systems. Both the projection of primary afferentfibers and of secondary afferent pathways to brainstem and cerebellum wereinvestigated with the anterograde transport of dextran amines as tracers (biotinylated dextran amine and tetramethyl rhodamine dextran amine). For comparison, the projections of spinocerebellar systems of wing and leg were studied also. Complementary experiments using retrograde tracers (Fast Blue,tetramethyl rhodamine dextran amine, rhodamine isothiocyanate) injected into the cerebellum served to corroborate the results of the anterograde tracing experiments. Primary neck afferent fibers terminated in the spinal graysubstance with dense terminal fields in laminae I to V of the dorsal horn and lamina IX of the ventral horn as well as in the marginal nuclei locatedat the lateral border of the spinal cord. In the brainstem, dense terminalfields were seen in deep layers of the medullary dorsal horn, in the external cuneate nucleus, and in group x. Secondary neck afferents arising from ventral horn cells showed a significant projection to the descending and medial vestibular nuclei and to the medial cerebellar nucleus. Terminals werefound both in the anterior and the posterior cerebellum. A quantitative evaluation disclosed that most terminals of neck afferents distributed in lobules II-TV of the anterior cerebellum and lobule IX of the posterior cerebellum. With injections aimed at spinocerebellar neurons located into the cervical and lumbosacral enlargements, no projections were found in the vestibular or deep cerebellar nuclei. Projections from the cervical enlargement were concentrated in lobules III-V and those from the lumbosacral enlargement in lobules III-VI. This points to a rostrocaudal somatotopic representation of neck, wing, and leg in the anterior cerebellum. The results of the retrograde tracing experiments support such a somatotopic organization. J. Comp. Neurol. 429:403-418, 2001. (C) 2001 Wiley-Liss, Inc.

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Documento generato il 30/11/20 alle ore 12:30:07