Abstract
The sciurid retina projects to the contralateral superior colliculus, pretectal complex, ventral nucleus of the lateral geniculate body and to five distinct zones in the dorsal nucleus of the lateral geniculate. Ipsilateral projections are distributed to the same targets except the superior colliculus. Zones of terminal debris as identified by the Fink-Heimer method do not develop uniformly; instead some structures become argyrophyllic before others do so that an injudicious choice of survival times may produce misleading data.The topography of the retinal mosaic is preserved in all its projections except those to the accessory optic system. In the cases of the superior colliculus, ventral nucleus of the lateral geniculate body and the anterior pretectal nucleus, these retinal projections are in perfect register with other afferent connections which are also retinotopically organized. An enormous proportion of the cells in the dorsal nucleus of the lateral geniculate body are connected with the overlapping portions of the retina; only a very small part of this structure receives input from the much larger nonoverlapping retinal quadrants.
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