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Titolo:
Auditory thalamocortical projections in the cat: Laminar and areal patterns of input
Autore:
Huang, CL; Winer, JA;
Indirizzi:
Univ Calif Berkeley, Dept Mol & Cell Biol, Div Neurobiol, Berkeley, CA 94720 USA Univ Calif Berkeley Berkeley CA USA 94720 urobiol, Berkeley, CA 94720 USA
Titolo Testata:
JOURNAL OF COMPARATIVE NEUROLOGY
fascicolo: 2, volume: 427, anno: 2000,
pagine: 302 - 331
SICI:
0021-9967(20001113)427:2<302:ATPITC>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDIAL GENICULATE-BODY; SOMATIC SENSORY CORTEX; POSTERIOR ECTOSYLVIAN GYRUS; RAPID GOLGI METHOD; INDIVIDUAL X-CELL; VISUAL-CORTEX; LAYER-I; STRIATE CORTEX; HORSERADISH-PEROXIDASE; SOMATOSENSORY CORTEX;
Keywords:
thalamus; neocortex; hearing; axons; forebrain; cortex;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
172
Recensione:
Indirizzi per estratti:
Indirizzo: Huang, CL Univ Calif Berkeley, Dept Mol & Cell Biol, Div Neurobiol, Room 285 Life Sci Addit, Berkeley, CA 94720 USA Univ Calif Berkeley Room 285 LifeSci Addit Berkeley CA USA 94720
Citazione:
C.L. Huang e J.A. Winer, "Auditory thalamocortical projections in the cat: Laminar and areal patterns of input", J COMP NEUR, 427(2), 2000, pp. 302-331

Abstract

Thalamocortical projections were studied in adult cats using biotinylated dextran amines, wheat germ agglutinin conjugated to horseradish peroxidase,and autoradiography with tritiated leucine and/or proline. The input from 7 architectonically defined nuclei to 14 auditory cortical fields was characterized qualitatively and quantitatively. The principal results were that 1) every thalamic nucleus projected to more than 1 field (range, 4-14 fields; mean, 7 fields); 2) only the projection from the ventral division to some primary fields (primary auditory cortex and posterior auditory cortex) had a periodic, clustered distribution, whereas the input from other divisions to nonprimary areas was continuous; 3) layers III-V received >85% of the total axonal profiles; 4) in most experiments, five or more layers were labeled; 5) the projections to nonprimary auditory areas had many laterally oriented axons; 6) the heaviest input to layer I in all experiments was usually in its upper half, suggesting a sublaminar arrangement; 7) the largest axonal trunks (up to 6 mum in diameter) arose from the medial division and ended in layer Ia, where they ran laterally for long distances; 8) there were three projection patterns: type 1 had its peak in layers III-TV with little input to layer I, and it arose from the ventral division and the dorsal superficial, dorsal, and suprageniculate nuclei of the dorsal division; type 2 had heavy labeling in layer I and less in layers III-TV, arising from the dorsal division nuclei primarily, especially the caudal dorsal and deep dorsal nuclei; and type 3 was a trimodal concentration in layers I, III-TV,and VI that originated chiefly in the medial division and had the lowest density of labeling; and 9) the quantitative profiles with the three methodswere very similar. The results suggest that the subdivisions of the auditory thalamus have consistent patterns of laminar distribution to different cortical areas, that an average of five or more layers receive significant input in a specific area, that a given thalamic nucleus can influence areas as far as 20 mm apart, that the first information to arrive at the cortex may reach layer I by virtue of the giant axons, and that several laminar patterns of auditory thalamocortical projection exist. The view that the auditory thalamus land perhaps other thalamic nuclei) serves mainly a relay function underestimates its many modes for influencing the cortex on a laminar basis. (C) 2000 Wiley-Liss, Inc.

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Documento generato il 04/04/20 alle ore 09:07:52