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Subcortical projections to the lateral geniculate body in the rat

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Summary

The subcortical projections to the lateral geniculate body (LGB) in the rat were studied by means of discrete HRP iontophoretic deposits in the dorsal or the ventral LGB; the labelling was compared to that resulting from HRP deposits in neighboring nuclei.

After injecting HRP in the dorsal LGB, labelled cells appeared bilaterally in the ventral LGB, pretectum, superior colliculus, lateral groups of the dorsal raphe nucleus and locus coeruleus. Ipsilaterally, labelled cells were found in the lateral posterior thalamus, nucleus of the posterior commissure and deep mesencephalic reticular nucleus.

After injecting HRP into the ventral LGB, labelled cells were observed bilaterally in the pretectum, superior colliculus and dorsal raphe nucleus (lateral groups). Contralateral labelling appeared in the ventral LGB and parabigeminal nucleus. Ipsilateral labelling was found in the zona incerta, lateral posterior thalamus, lateral and medial mesencephalic reticular formation, vestibular and dorsal tegmental nuclei.

These findings provide evidence of subcortical projections to the LGB arising in visually-related areas as well as extravisual areas, which might be related to the LGB boutons that survive complete cortical and retinal ablations.

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  1. Instituto de Neurobiología, Serrano 665, 1414, Buenos Aires, Argentina

    D. A. Pasquier & M. J. Villar

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  1. D. A. Pasquier
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  2. M. J. Villar
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Pasquier, D.A., Villar, M.J. Subcortical projections to the lateral geniculate body in the rat. Exp Brain Res 48, 409–419 (1982). https://doi.org/10.1007/BF00238617

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