PMID: 8586555Dec 1, 1995Paper

Segregation and convergence of specialised pathways in macaque monkey visual cortex

Journal of Anatomy
S Shipp, S M Zeki

Abstract

At the level of cortical area V2, the various visual inputs to the cortex have reorganised to form 3 distinct channels. Anatomically these are embodied in the thick and thin dark stripes, and paler interstripes characteristic of cytochrome oxidase architecture. Do the outputs of these compartments remain segregated at higher levels of processing, or are they in turn combined and repackaged? To examine this question we have injected distinct orthograde tracers into the functionally distinct areas V4 and V5 of one hemisphere in 3 macaque monkeys (Macaca fascicularis). V4 is known to receive input from both thin stripes and interstripes of V2, but some parts of V4 receive only interstripe afferents, others receive a relatively greater contribution from the thin stripes. Thus V4 itself is thought to possess subcompartments of at least two distinct types, acting to extend the blob-thin stripe and interblob-interstripe pathways through V1 and V2. The experiments reported here reveal no further divergence between these channels: both types of V4 subcompartment make rather similar patterns of connection with further visual areas and subcortical structures. In contrast to V4, area V5 receives input from the thick stripes of V2. V4 and V...Continue Reading

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