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Distribution of cortical neurons projecting to the superior colliculus in macaque monkeys

Cerkevich, CM and Lyon, DC and Balaram, P and Kaas, JH (2014) Distribution of cortical neurons projecting to the superior colliculus in macaque monkeys. Eye and Brain, 6. 121 - 137. ISSN 1179-2744

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Abstract

© 2014 Cerkevich et al. To better reveal the pattern of corticotectal projections to the superficial layers of the superior colliculus (SC), we made a total of ten retrograde tracer injections into the SC of three macaque monkeys (Macaca mulatta). The majority of these injections were in the superficial layers of the SC, which process visual information. To isolate inputs to the purely visual layers in the superficial SC from those inputs to the motor and multisensory layers deeper in the SC, two injections were placed to include the intermediate and deep layers of the SC. In another case, an injection was placed in the medial pulvinar, a nucleus not known to be strongly connected with visual cortex, to identify possible projections from tracer spread past the lateral boundary of the SC. Four conclusions are supported by the results: 1) all early visual areas of cortex, including V1, V2, V3, and the middle temporal area, project to the superficial layers of the SC; 2) with the possible exception of the frontal eye field, few areas of cortex outside of the early visual areas project to the superficial SC, although many do, however, project to the intermediate and deep layers of the SC; 3) roughly matching retinotopy is conserved in the projections of visual areas to the SC; and 4) the projections from different visual areas are similarly dense, although projections from early visual areas appear somewhat denser than those of higher order visual areas in macaque cortex.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Cerkevich, CMCERKEC@pitt.eduCERKEC
Lyon, DC
Balaram, P
Kaas, JH
Centers: Other Centers, Institutes, Offices, or Units > Systems Neuroscience Institute
Date: 1 January 2014
Date Type: Publication
Journal or Publication Title: Eye and Brain
Volume: 6
Page Range: 121 - 137
DOI or Unique Handle: 10.2147/eb.s53613
Schools and Programs: School of Medicine > Neurobiology
Refereed: Yes
ISSN: 1179-2744
Date Deposited: 22 May 2015 21:43
Last Modified: 30 Oct 2018 13:55
URI: http://d-scholarship.pitt.edu/id/eprint/24744

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