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Articles

The prenatal development of the cat's retinogeniculate pathway

CJ Shatz
Journal of Neuroscience 1 March 1983, 3 (3) 482-499; DOI: https://doi.org/10.1523/JNEUROSCI.03-03-00482.1983
CJ Shatz
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Abstract

The prenatal development of connections between the retina and the lateral geniculate nucleus (LGN) was studied by means of the anterograde axonal transport of 3H-amino acids or horseradish peroxidase injected intraocularly in fetal cats older than embryonic day 27 (E27) and in newborn cats. (Gestation is 65 days.) A retinothalamic pathway exists as early as E28, when label can be seen in both ipsilateral and contralateral optic tracts. Afferents from the contralateral eye are the first to invade the anlage of the LGN by E32 with those from the ipsilateral eye following about 3 days later. Initially, the pattern of labeling within the nucleus is uniform, suggesting that the two sets of afferents must share a good deal of territory at early ages. By E47, however, gaps appear in the labeling pattern contralaterally, indicating that afferents from the two eyes are beginning to segregate from each other. Segregation continues so that by E54 it is possible to identify unambiguously regions of the LGN destined to comprise ipsilateral and contralateral eye layers. By birth, afferent input appears adult-like in organization, with the two sets of afferents almost completely segregated from each other into their appropriate layers. Cellular lamination of the nucleus has just commenced, however, thereby lagging the onset of afferent segregation by about 2 weeks. Prenatal development could be followed much more easily in the horizontal than in the coronal plane of section due to the finding here that the LGN is displaced approximately 90 degrees in the horizontal plane between E40 and E60. Measurements of the area occupied by the ipsilateral and contralateral afferents within the LGN indicated that even prior to segregation, the two sets of afferents are not completely intermixed within the LGN. On the contrary, those from the contralateral eye retain almost exclusive control of some territory throughout development. This detail contrasts with development in primates, in which intermixing of afferents from the two eyes is thought to be complete early on (Rakic, P. (1976) Nature 261: 467–471). Nevertheless, in the cat, as in other mammals, development of the retinogeniculate pathway is broadly characterized by an initial period of overlap followed by a period of segregation that gives rise to the adult pattern of afferent input.

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The Journal of Neuroscience: 3 (3)
Journal of Neuroscience
Vol. 3, Issue 3
1 Mar 1983
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The prenatal development of the cat's retinogeniculate pathway
CJ Shatz
Journal of Neuroscience 1 March 1983, 3 (3) 482-499; DOI: 10.1523/JNEUROSCI.03-03-00482.1983

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The prenatal development of the cat's retinogeniculate pathway
CJ Shatz
Journal of Neuroscience 1 March 1983, 3 (3) 482-499; DOI: 10.1523/JNEUROSCI.03-03-00482.1983
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