Abstract
We examined the distribution of pulvinar afferents to visual area V2 of macaque monkey cerebral cortex in relation to the distribution of the metabolic enzyme cytochrome oxidase (CO). V2 contains three sets of stripelike subregions that are marked by differential staining for CO, and which have different corticocortical connections. The pulvinar provides the major subcortical input to V2, and this input is known to be patchy. We were interested to determine how the pattern of pulvinar afferents relates to the layout of the three stripelike compartments that characterize V2. We made large injections of WGA-HRP into the pulvinar (labelling both the inferior and lateral divisions) and mapped the resulting orthograde terminal and retrograde cell label within V2. We observed pulvinar terminal label mainly in lower layer 3 (at the layer 4 border), with light label in layer 1 as well; terminal label in layers 3–4 was distributed in discrete patches with faint bridges of light label between. Comparison with adjacent sections stained for CO or Cat-301 showed that pulvinar terminal zones aligned precisely with regions of increased CO staining, and targeted both “thick” (Cat-301+) and “thin” CO-rich stripes, avoiding the pale stripes (which aligned with the faint bridges of terminal label). Retrogradely labelled cells were found in layers 5A and 6, but the bulk of the feedback to pulvinar arose from layer 6 rather than layer 5 (unlike V1, where feedback to pulvinar arises primarily from layer 5B). These results show that the increased CO staining in certain subregions of V2 is closely correlated with the presence of thalamic terminals from the pulvinar. Although we cannot rule out the possibility that different sets of pulvinar neurons project to different CO compartments in V2, the presence of a prominent thalamic input shared by the “thick” and “thin” CO stripes (which receive different V1 afferents and make different feedforward projections to other visual cortical areas) could underlie the preferential intrinsic interconnections shown to exist between these V2 subregions and suggests another potential source of integration between the two cortical visual streams.
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Levitt, J.B., Yoshioka, T. & Lund, J.S. Connections between the pulvinar complex and cytochrome oxidase-defined compartments in visual area V2 of macaque monkey. Exp Brain Res 104, 419–430 (1995). https://doi.org/10.1007/BF00231977
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DOI: https://doi.org/10.1007/BF00231977