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Representation of the temporal raphe within the optic tract of the cat

Published online by Cambridge University Press:  02 June 2009

T. Fitzgibbon  and
W. Burke
T. Fitzgibbon
Affiliation:
Physiology Department, University of Sydney, Australia
W. Burke
Affiliation:
Physiology Department, University of Sydney, Australia
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Abstract

The retinal topography of the cat's optic tract was determined by means of injections of the enzyme horseradish peroxidase (HRP) into the tract. This analysis was accomplished by the subtraction of all HRP injection sites not labeling a defined retinal area from those injection sites which resulted in ganglion cell labeling (Venn diagram analysis). Using this method, the following correspondences were demonstrated for the ipsilateral and contralateral projections: superior retina represented in medial optic tract; inferior retina in lateral tract; and area centralis in a dorsocentral location (which was part of a larger area representing the visual streak). The temporal raphe was represented in the ipsilateral tract as a band curving from the area centralis region toward the dorsomedial border of the tract. Contralateral fibers from a region superior to the optic disc were found to be displaced with respect to the general retinal representation in the optic tract and this appeared to be related to retinal development. The ratio of contralateral to ipsilateral fibers was determined and found to be nonuniform within the tract.

Injection of HRP into the optic tract of the cat also allowed the axons from labeled retinal ganglion cells to be traced within the retina and optic disc. Axons from ganglion cells lying temporal to the raphe curve around the area centralis enter the optic disc on the lateral and inferior aspects. Ganglion cells lying nasal to the raphe send their axons more directly to enter the optic disc on its superior aspect. A schema is proposed whereby the retina is mapped onto the optic tract.

Keywords

Optic tractRetinotopicTemporal rapheTopographyOptic disc
Type
Research Article
Information
Visual Neuroscience , Volume 2 , Issue 3 , March 1989 , pp. 255 - 267
Copyright
Copyright © Cambridge University Press 1989

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