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Visual callosal projections in the adult ferret

Published online by Cambridge University Press:  02 June 2009

Antony M. Grigonis ,
Rosemary B. Rayos Del Sol-Padua  and
E. Hazel Murphy
Antony M. Grigonis
Affiliation:
Department of Anatomy, Hahnemann University, Philadelphia
Rosemary B. Rayos Del Sol-Padua
Affiliation:
Department of Pediatrics, Medical College of Pennsylvania/EPPl, Philadelphia
E. Hazel Murphy
Affiliation:
Department of Anatomy and Neurobiology, Medical College of Pennsylvania/EPPI, Philadelphia
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Abstract

The laminar and tangential organization of visual callosal projections of areas 17 and 18 were investigated in the adult ferret, using histochemical methods to visualize axonally transported horseradish peroxidase (HRP). Normal adult ferrets were given injections of HRP throughout one visual cortex or had gelfoam soaked in HRP applied to the transected corpus callosum. The ferret callosal cell distribution has a greater tangential extent in area 18 than in area 17. In addition, the radial organization of callosal cells in areas 17 and 18 differs: three times as many infragranular cells are present in area 18 than in area 17, although the number of supragranular cells is similar for both areas 17 and 18. Since the projections of alpha retinal ganglion cells are reported to be exclusively contralateral in the ferret (Vitek et al., 1985), callosal projections may make a major contribution to the binocularity of neurons in area 18.

Keywords

Corpus callosumVisual cortex
Type
Research Articles
Information
Visual Neuroscience , Volume 9 , Issue 1 , July 1992 , pp. 99 - 103
Copyright
Copyright © Cambridge University Press 1992

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