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Titolo:
LACK OF TOPOGRAPHY IN THE VENTRAL NUCLEUS OF THE LATERAL LEMNISCUS
Autore:
GLENDENNING KK; HUTSON KA;
Indirizzi:
FLORIDA STATE UNIV,DEPT PSYCHOL,PROGRAM NEUROSCI TALLAHASSEE FL 32306 UNIV TOLEDO,DEPT PSYCHOL TOLEDO OH 43606
Titolo Testata:
Microscopy research and technique
fascicolo: 4, volume: 41, anno: 1998,
pagine: 298 - 312
SICI:
1059-910X(1998)41:4<298:LOTITV>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUPERIOR OLIVARY COMPLEX; AUDITORY BRAIN-STEM; RAT SPINAL-CORD; BUSHY CELL AXONS; INFERIOR COLLICULUS; COCHLEAR NUCLEUS; TONOTOPIC ORGANIZATION; ASCENDING PROJECTIONS; STRYCHNINE BINDING; DORSAL NUCLEUS;
Keywords:
VENTRAL NUCLEUS LATERAL LEMNISCUS; CAT; 2-DG; TONOTOPICITY; VLL; FLUORESCENT DYES;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
115
Recensione:
Indirizzi per estratti:
Citazione:
K.K. Glendenning e K.A. Hutson, "LACK OF TOPOGRAPHY IN THE VENTRAL NUCLEUS OF THE LATERAL LEMNISCUS", Microscopy research and technique, 41(4), 1998, pp. 298-312

Abstract

In contrast to the ease of finding tonotopicity in other nuclei, bothanatomical. and electrophysiological methods have failed to demonstrate a clear and simple tonotopic map within the ventral nucleus of the lateral lemniscus (VLL). The present study was undertaken in cat with the hope that methods not used previously in studies of VLL might succeed in demonstrating an orderliness in its exiting fibers (i.e., efferents) or its incoming fibers (i.e., afferents). Since the same organization of ascending frequencies present in the cochlea is maintained inthese fibers as well as in all main auditory nuclei, demonstration ofa similar organization of frequencies in VLL would be evidence of thecochleo-or tono-topicity of this nucleus. Using triple injection of 3different fluorescent dyes in inferior colliculus to study efferents,orderly and tonotopic cell-labeling is found in each of the brainstemauditory nuclei, with the notable exception of VLL. Instead, labelingof cell clusters, each cluster containing a small number of cells, isfound randomly distributed throughout VLL in all 3 of its spatial dimensions. Using the 2-deoxyglucose (2-DG) method, during stimulation at6 different frequencies, afferent orderliness, indeed, tonotopicity is found in all major brainstem auditory nuclei, again with the notableexception of VLL. Rather, each frequency evokes 2-DG label throughoutVLL. In agreement with the results based on electrophysiological methods, therefore, the anatomical methods used here also yield no evidence of tonotopicity in VLL. Thus, if there is orderliness in VLL's efferents or afferents, it is based on an auditory dimension incommensuratewith frequency. (C) 1998 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 04:30:41