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Titolo:
MORPHOLOGY AND CONNECTIONS OF NEURONS IN AREA-17 PROJECTING TO THE EXTRASTRIATE AREAS MT AND 19DM AND TO THE SUPERIOR COLLICULUS IN THE MONKEY CALLITHRIX-JACCHUS
Autore:
WEISENHORN DMV; ILLING RB; SPATZ WB;
Indirizzi:
UNIV FREIBURG,DEPT OTORHINOLARYNGOL,MORPHOL BRAIN RES UNIT,KILLIANSTR5 D-79106 FREIBURG GERMANY UNIV FREIBURG,DEPT OTORHINOLARYNGOL,MORPHOL BRAIN RES UNIT D-79106 FREIBURG GERMANY
Titolo Testata:
Journal of comparative neurology
fascicolo: 2, volume: 362, anno: 1995,
pagine: 233 - 255
SICI:
0021-9967(1995)362:2<233:MACONI>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
TEMPORAL VISUAL AREA; MACAQUE STRIATE CORTEX; RETINAL GANGLION-CELLS; LATERAL GENICULATE-NUCLEUS; MEYNERT CELLS; CORTICAL CONNECTIONS; OWL MONKEY; PYRAMIDAL NEURONS; TOPOGRAPHIC ORGANIZATION; AOTUS-TRIVIRGATUS;
Keywords:
MEYNERT CELLS; INTRACELLULAR LUCIFER YELLOW FILLING; MORPHOMETRY; MARMOSET;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
121
Recensione:
Indirizzi per estratti:
Citazione:
D.M.V. Weisenhorn et al., "MORPHOLOGY AND CONNECTIONS OF NEURONS IN AREA-17 PROJECTING TO THE EXTRASTRIATE AREAS MT AND 19DM AND TO THE SUPERIOR COLLICULUS IN THE MONKEY CALLITHRIX-JACCHUS", Journal of comparative neurology, 362(2), 1995, pp. 233-255

Abstract

Neurons of area 17, the primary visual cortex, project to various anatomically and physiologically different extrastriate areas and subcortical regions. In the present investigation, we addressed the question of whether the efferent neurons in area 17 can contribute to functional diversity between these regions. We approached this question by analyzing the dendritic morphology of neurons in area 17 projecting to area MT, area 19DM, and the superior colliculus in the new world simian primate Callithrix jacchus, because dendritic morphology is an important factor in determining physiological properties of nerve cells. Retrograde transport of fluorochromes injected into the target regions, andintracellular injections of Lucifer yellow in the prelabelled neurons, revealed the following. 1) Morphologically identical large pyramidalcells in layer VI of area 17 project to all three targets. Some of them possess axon collaterals to two or all three targets, suggesting that they provide common information to all three areas. 2) Pyramidal cells in layer IIIc projecting to area MT form a morphologically homogeneous population. 3) Three small to medium-sized pyramidal cell types in layers IIIa-c, spiny stellate cells in layer IIIc, and another largepyramidal cell type in layer VI project to area 19DM. 4) Pyramidal cells in the lower two-thirds of layer V in area 17 project to the superior colliculus. In conclusion, we have shown that in Callithrix one efferent pathway may originate from several cell types. However, with the exception of the large cells in layer VI, efferent cells projecting to area MT, area 19DM, and the superior colliculus were morphologically distinct. This suggests that functional differences between brain regions could arise in part from morphological heterogeneity between andwithin the efferent cell populations. (C) 1995 Wiley-Liss, Inc.

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Documento generato il 14/08/20 alle ore 16:57:52