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Titolo:
MORPHOLOGY AND SPATIAL-DISTRIBUTION OF CORTICOTHALAMIC TERMINALS ORIGINATING FROM THE CAT AUDITORY-CORTEX
Autore:
BAJO VM; ROUILLER EM; WELKER E; CLARKE S; VILLA AEP; DERIBAUPIERRE Y; DERIBAUPIERRE F;
Indirizzi:
UNIV LAUSANNE,INST PHYSIOL,RUE BUGON 7 LAUSANNE SWITZERLAND INST ANAT LAUSANNE SWITZERLAND INST PHYSIOL FRIBOURG SWITZERLAND DEPT BIOL CELULAR & PATOL SALAMANCA SPAIN
Titolo Testata:
Hearing research
fascicolo: 1-2, volume: 83, anno: 1995,
pagine: 161 - 174
SICI:
0378-5955(1995)83:1-2<161:MASOCT>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDIAL GENICULATE-BODY; ANTEROVENTRAL COCHLEAR NUCLEUS; SQUIRREL SCIURUS-CAROLINENSIS; LEUKOAGGLUTININ PHA-L; TONOTOPIC ORGANIZATION; FUNCTIONAL-ORGANIZATION; RESPONSE PROPERTIES; CORTICAL FIELDS; SINGLE NEURONS; BARREL CORTEX;
Keywords:
CAT; AUDITORY CORTEX; MEDIAL GENICULATE BODY; BIOCYTIN; ANTEROGRADE TRACER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
70
Recensione:
Indirizzi per estratti:
Citazione:
V.M. Bajo et al., "MORPHOLOGY AND SPATIAL-DISTRIBUTION OF CORTICOTHALAMIC TERMINALS ORIGINATING FROM THE CAT AUDITORY-CORTEX", Hearing research, 83(1-2), 1995, pp. 161-174

Abstract

In this paper we studied the morphology and spatial distribution of corticothalamic axons and terminals originating from the auditory cortical fields of the cat. The anterograde tracer biocytin was injected atelectrophysiologically characterized loci in the primary (AI) (N = 2), anterior (AAF) (N = 1), posterior (PAF) (N = 1) and secondary (AII) (N = 2) auditory fields. In all cases, two different types of labeled terminals were found in the auditory thalamus: small spherical endings(1-2 mu m) and giant, finger-like endings (5-10 mu m). After biocytininjections in AI and AAF, the majority of anterogradely labeled axonsterminated in the rostral half of the pars lateralis (LV) of the ventral division of the medial geniculate body (vMGB). In LV, the corticothalamic axons ramified profusely, giving rise to dense terminal fieldsforming well delineated curved stripes, with small spherical endings. Additional terminal fields formed by small endings were observed in the medial division of the medial geniculate body (mMGB). Giant endingswere observed in a small area in the dorsal nucleus (D) of the dorsaldivision of the medial geniculate body (dMGB), near its border with the vMGB. PAF projections were located in the caudal half of vMGB and in mMGB, where only small terminals were found. Giant endings were seenin the superficial part of dMGB emerging from labeled corticothalamicaxons oriented in parallel to the dorsal surface of the MGB. Projections from AII gave rise to a main terminal field of small endings in D;a second terminal field consisting of giant endings intermingled withsmall endings was found in the deep dorsal nucleus (DD) of dMGB. We conclude that small terminals serve the feedback projection to the thalamic nucleus from which the injected cortical field receives its main input, whereas giant terminals cross the borders between the parallel ascending auditory pathways.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 16:17:49