Please use this identifier to cite or link to this item: https://doi.org/10.1002/cne.22552
Title: Superior colliculus connections with visual thalamus in gray squirrels (Sciurus carolinensis): Evidence for four subdivisions within the pulvinar complex
Authors: Baldwin, M.K.
Wong, P. 
Reed, J.L.
Kaas, J.H.
Keywords: Dorsal thalamus
Lateral geniculate nucleus
Pulvinar
Rodents
Superior colliculus
Issue Date: 15-Apr-2011
Citation: Baldwin, M.K., Wong, P., Reed, J.L., Kaas, J.H. (2011-04-15). Superior colliculus connections with visual thalamus in gray squirrels (Sciurus carolinensis): Evidence for four subdivisions within the pulvinar complex. Journal of Comparative Neurology 519 (6) : 1071-1094. ScholarBank@NUS Repository. https://doi.org/10.1002/cne.22552
Abstract: As diurnal rodents with a well-developed visual system, squirrels provide a useful comparison of visual system organization with other highly visual mammals such as tree shrews and primates. Here, we describe the projection pattern of gray squirrel superior colliculus (SC) with the large and well-differentiated pulvinar complex. Our anatomical results support the conclusion that the pulvinar complex of squirrels consists of four distinct nuclei. The caudal (C) nucleus, distinct in cytochrome oxidase (CO), acetylcholinesterase (AChE), and vesicular glutamate transporter-2 (VGluT2) preparations, received widespread projections from the ipsilateral SC, although a crude retinotopic organization was suggested. The caudal nucleus also received weaker projections from the contralateral SC. The caudal nucleus also projects back to the ipsilateral SC. Lateral (RLl) and medial (RLm) parts of the previously defined rostral lateral pulvinar (RL) were architectonically distinct, and each nucleus received its own retinotopic pattern of focused ipsilateral SC projections. The SC did not project to the rostral medial (RM) nucleus of the pulvinar. SC injections also revealed ipsilateral connections with the dorsal and ventral lateral geniculate nuclei, nuclei of the pretectum, and nucleus of the brachium of the inferior colliculus and bilateral connections with the parabigeminal nuclei. Comparisons with other rodents suggest that a variously named caudal nucleus, which relays visual inputs from the SC to temporal visual cortex, is common to all rodents and possibly most mammals. RM and RL divisions of the pulvinar complex also appear to have homologues in other rodents. © 2010 Wiley-Liss, Inc.
Source Title: Journal of Comparative Neurology
URI: http://scholarbank.nus.edu.sg/handle/10635/126549
ISSN: 00219967
DOI: 10.1002/cne.22552
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