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Connections of calbindin-D28k-defined subdivisions in inferior pulvinar with visual areas V2, V4 and MT in macaque monkeys

Published online by Cambridge University Press:  12 April 2006

Brendan O’Brien ,
Paul Abel  and
Jaime Olavarria
Brendan O’Brien
Affiliation:
Graduate Program in Neurobiology and Behavior and Department of Psychology, University of Washington, P.O. Box 351525, Seattle, WA 98195-1525, USA Present address: Neuroanatomie, Max Planck Institut fur Hirnforchung, Deutschordenstrasse 46 D-60528, Frankfurt, Germany.
Paul Abel
Affiliation:
Graduate Program in Neurobiology and Behavior and Department of Psychology, University of Washington, P.O. Box 351525, Seattle, WA 98195-1525, USA Present address: Intel Corporation, New Business Group, Connected Products Division JF2-11, 2111 N.E. 25th Avenue, Hillsboro, OR 97124-5961, USA.
Jaime Olavarria
Affiliation:
Graduate Program in Neurobiology and Behavior and Department of Psychology, University of Washington, P.O. Box 351525, Seattle, WA 98195-1525, USA
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Abstract

We examined the relationship between calbindin-D28k-defined subdivisions in the macaque inferior pulvinar and the patterns of afferent connections to cortical visual areas MT, V4 and V2. The subdivisions identified included the posterior (PIp), medial (PIm), central (PIc) and lateral (PIl) subdivisions. Projections to MT and V4 were largely segregated in the inferior pulvinar: projections to MT originated mainly from PIm, while projections to V4 originated mainly from PIl. In addition, weaker projections to MT were observed from PIp and PIc, and some projections from PIp to V4 were observed in one of two cases. Projections to V2 originated preferentially from PIl, with a lesser projection from PIc. No labeled cells were observed in PIm in five monkeys injected with various tracers into different regions of V2. Since most V2 injections were large enough to involve several neighboring stripe-like compartments, these findings suggest that PIm does not project to V2 compartments associated with neither dorsal nor ventral cortical processing streams. Cells projecting to V4 were not strictly segregated from those projecting to V2 in neither PIl nor PIc, suggesting that inferior pulvinar projections do not map the position of visual areas in the cortical mantle.

Keywords

Visual thalamusThalamocortical connectionsExtrastriate cortexPrimatesCalcium-binding proteins
Type
Research Article
Information
Thalamus & Related Systems , Volume 1 , Issue 4 , June 2002 , pp. 317 - 330
Copyright
2002 Elsevier Science Ltd

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