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- W1978384427 abstract "Multiple retrograde labelling techniques were used to determine whether the superior collicular (SC) cells that project to the spinal cord in hamster and rat also innervate the contralateral colliculus. In 25 rats and 13 hamsters, various combinations of the tracers horseradish peroxidase, True blue, Diamidino yellow, fluorogold and rhodamine-labelled latex microspheres were used to label tectospinal and SC commissural neurons. No double-labelled cells were observed in any of these experiments. Analysis of neurons that were retrogradely labelled with horseradish peroxidase showed further that SC commissural neurons were much smaller than tectospinal cells. The average soma area for tectospinal cells in hamster was 225.9 μm2 and that for such neurons in rat was 214.4 μm2. The mean soma areas for SC commissural neurons in hamster and rat were 85.4 μm2 and 91.5 μm2, respectively. In additional experiments (6 rats and 6 hamsters), True blue was injected into the left predorsal bundle and Diamidino yellow was deposited into the left SC. In both hamsters and rats, these injections invariably produced a small number of double-labelled cells in the deep layers of the right SC. In a final group of animals (7 rats and 2 hamsters), large thalamic deposits of Diamidino yellow were combined with bilateral injections of True blue into the spinal cord. This combination also produced small numbers of double-labelled neurons in both colliculi. These results indicate that the tectospinal and SC commissural pathways arise from distinct neuronal populations, but that a small number of cells that send axons into the predorsal bundle also have commissural collaterals. They demonstrate further that some tectospinal cells also send axon collaterals to the thalamus." @default.
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- W1978384427 date "1987-07-01" @default.
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- W1978384427 title "The spinal and commissural projections from the superior colliculus in rat and hamster arise from distinct neuronal populations" @default.
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- W1978384427 doi "https://doi.org/10.1016/0006-8993(87)90206-x" @default.
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