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Retinal projections in the ground squirrel (Citellus tridecemlineatus)

Published online by Cambridge University Press:  02 June 2009

Seema Agarwala
Affiliation:
Department of Psychology, State University of New York at Stony Brook, Stony Brook
Heywood M. Petry
Affiliation:
Department of Psychology, State University of New York at Stony Brook, Stony Brook
Jack G. May III
Affiliation:
Department of Psychology, State University of New York at Stony Brook, Stony Brook

Abstract

The retinal projections of the thirteen-lined ground squirrel were determined by tracing anterograde transport of intravitreally injected horseradish peroxidase (HRP) or wheat-germ conjugated horseradish peroxidase (WGA-HRP). Label was seen in the suprachiasmatic nucleus and adjacent anterior hypothalamic area, the accessory optic system (the medial, dorsal, and lateral terminal nuclei), the dorsal and ventral lateral geniculate nuclei, the intergeniculate leaflet, the pretectal nuclei (the anterior, posterior, and olivary pretectal nuclei and the nucleus of optic tract), and the superior colliculus. Most of these structures were labeled bilaterally, with dense contralateral label and sparse ipsilateral label, a pattern typical for animals with laterally placed eyes. However, the suprachiasmatic nucleus and the nucleus of the optic tract received input only from the contralateral eye. In contrast to previous degeneration studies, the sensitive HRP tracers (in conjunction with cytochrome-oxidase reactivity) revealed an elaborate organization within the lateral geniculate nucleus (dorsal LGN, ventral LGN, and intergeniculate leaflet) that is consistent with existing organizational schemes for other mammalian species.

Information

Type
Research Articles
Copyright
Copyright © Cambridge University Press 1989

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