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Organization of reciprocal connections between area 17 and the lateral suprasylvian area of cat visual cortex

Published online by Cambridge University Press:  02 June 2009

Stewart Shipp  and
Simon Grant
Stewart Shipp
Affiliation:
Department of Anatomy and Developmental Biology, University College, London, UK Department of Anatomy, The Medical College of Pennsylvania, Philadelphia
Simon Grant
Affiliation:
Department of Anatomy and Developmental Biology, University College, London, UK Department of Anatomy, The Medical College of Pennsylvania, Philadelphia
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Abstract

The lateral suprasylvian (LS) area (or Clare-Bishop area) is a region of visual cortex in the cat which has been defined as an isolated projection zone of area 17 (VI or striate cortex) within the suprasylvian sulcus. We have studied the overall topography and detailed pattern of connection between these two visual areas following injections of WGA-HRP into one or the other.

The projection from area 17 to LS is formed largely (-90%) from supragranular layer neurons that are distributed, in the coronal plane, in multiple regularly spaced patches. These patches are especially prominent in regions of area 17 representing central vision along and around the horizontal meridian. In reconstructions of serial coronal sections, and in flatmounts of the same region, the patches are seen to align so that in the plane tangential to the cortical surface they appear as a system of parallel bands whose main axis of elongation is rostro-ventral to caudo-dorsal, or near parallel to the area 17/18 border. The mean periodicity of the bands is about 1.0 mm.

The projection from area 17 terminates mainly in layers 4, 3, and 2 of area LS, and also appears patchy in the coronal plane. Reconstruction of the cortical surface view again reveals a system of rostrocaudal bands, but with a mean periodicity of 2 mm. The back projection is less periodically organized, arising predominantly (-80%) from a continuous sheet of infragranular neurons in area LS and terminating mainly in layer 1 of area 17, across the underlying patch and interpatch zones of the supragranular projection cells. However, neurons in layers 2 and upper 3 of area LS, which form the minority origin of the back projection, are mostly located in columnar registration with the patches of area 17 terminals.

The bands of supragranular layer neurons projecting to area LS are aligned obliquely to the iso-orientation domains of area 17, indicating a further component to its organization. It is suggested that this may correspond to a segregation of the X and Y channels in area 17, with outputs to area LS selectively arising from the Y pathway, in accordance with previous reports.

Keywords

Projection bandsTermination bandsX pathwaysY pathways
Type
Research Articles
Information
Visual Neuroscience , Volume 6 , Issue 4 , April 1991 , pp. 339 - 355
Copyright
Copyright © Cambridge University Press 1991

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