Retinal projections to the superior colliculus and dorsal lateral geniculate nucleus in the tammar wallaby (Macropus eugenii): I. Normal topography
- 8 May 1988
- journal article
- research article
- Published by Wiley in Journal of Comparative Neurology
- Vol. 271 (2) , 257-273
- https://doi.org/10.1002/cne.902710207
Abstract
The topography of retinal projections to the superior colliculus and dorsal lateral geniculate nucleus of a wallaby, the tammar (Macropus eugenii), was investigated by an anatomical method. Small laser lesions were made in the retinas of experimental animals, and the remaining retinal projections were visualized by means of horseradish‐peroxidase histochemistry. The position of each lesion was correlated with the position of the filling defects in the terminal label.The whole of the retina projects to the contralateral superior colliculus. The nasal retina is represented caudally, and the temporal retina rostrally. The ventral retina is represented medially, and the dorsal retina laterally. There is a projection to the ipsilateral superior colliculus, but it is patchy and its topography could not be determined by this method. The retinotopic map in the contralateral dorsal lateral geniculate nucleus has the nasal retina represented rostrally and the temporal retina caudally in the nucleus. The dorsal retina is represented ventrally, and the ventral retina is represented dorsally. It appears that the whole of the retina projects contralaterally, and in addition the temporal retina projects ipsilaterally. The maps of visual space through the two eyes were shown to be in topographic register in the binocular region by making a deposit of HRP in the visual cortex. This resulted in a column of retrogradely labeled cells in the nucleus. This column crossed the laminae, which are innervated by the ipsilateral and contralateral eye at right angles.Keywords
This publication has 43 references indexed in Scilit:
- Morphology and distribution of neurons in the retinal ganglion cell layer of the adult tammar wallaby?Macropus eugeniiJournal of Comparative Neurology, 1986
- Extensive recrossing of retinotectal axons after neonatal unilateral superior collicular lesions in hamsterDevelopmental Brain Research, 1985
- The dorsal lateral geniculate nucleus of macropodid marsupials: Cytoarchitecture and retinal projectionsJournal of Comparative Neurology, 1984
- Ganglion cell death during development of ipsilateral retino-collicular projection in golden hamsterNature, 1984
- Visuotopic organization of the superior colliculus of the opossumExperimental Brain Research, 1982
- The distribution and sizes of ganglion cells in the retinas of five Australian marsupialsJournal of Comparative Neurology, 1981
- Normal and abnormal uncrossed retinotectal pathways in rats: An HRP study in adultsJournal of Comparative Neurology, 1980
- Anomalous ipsilateral retinotectal projections in syrian hamsters with early lesions: Topography and functional capacityJournal of Comparative Neurology, 1979
- Some Principles of Organization in the Dorsal Lateral Geniculate Nucleus; pp. 253–267Brain, Behavior and Evolution, 1972
- The projection of optic fibers to the visual centers in the catJournal of Comparative Neurology, 1966