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Lack of intra laminar sprouting of retinal axons in monkey lateral geniculate nucleus

, : Lack of intra laminar sprouting of retinal axons in monkey lateral geniculate nucleus. Brain Research 126(2): 201-210

In the dorsal lateral geniculate nucleus (LGN) of the adult cat there is no evidence for translaminar sprouting of retinal axons to fill sites freed of retinal endings from the other eye. The possibility was tested that retinal axons will sprout to fill denervated retinal sites within laminae of the monkey LGN. In 4 monkeys, retinal ganglion cell axons from either the upper or lower half of the retina were destroyed. To maximize the potential for sprouting in the LGN, on 1 side of the brain the LGN cells to which the remaining retinal axons normally project were removed by ablation of the appropriate portion of the striate cortex. Three months later the eye receiving the retinal lesion was injected with [3H]proline and the retinal projection to the LGN on both sides of the brain was studied using autoradiography. There was no evidence of intralaminar sprouting of retinal axons either in the normal LGN or in the LGN in which the usual targets of retinal axons were removed.


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