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- W2078561543 abstract "Lampreys are jawless vertebrates, the most basal group of extant vertebrates. This phylogenetic position makes them invaluable models in comparative studies of the vertebrate central nervous system. Lampreys have been used as vertebrate models to study the neuronal circuits underlying locomotion control and axonal regeneration after spinal cord injury. Inhibitory inputs are key elements in the networks controlling locomotor behaviour, but very little is known about the descending inhibitory projections in lampreys. The aim of this study was to investigate the presence of brain-spinal descending inhibitory pathways in larval stages of the sea lamprey Petromyzon marinus by means of tract-tracing with neurobiotin, combined with immunofluorescence triple-labeling methods. Neurobiotin was applied in the rostral spinal cord at the level of the third gill, and inhibitory populations were identified by the use of cocktails of antibodies raised against glycine and GABA. Glycine-immunoreactive (-ir) neurons that project to the spinal cord were observed in three rhombencephalic reticular nuclei: anterior, middle and posterior. Spinal-projecting GABA-ir neurons were observed in the anterior and posterior reticular nuclei. Double glycine-ir/GABA-ir spinal cord-projecting neurons were only observed in the posterior reticular nucleus, and most glycine-ir neurons did not display GABA immunoreactivity. The present results reveal the existence of inhibitory descending projections from brainstem reticular neurons to the spinal cord, which were analyzed in comparative and functional contexts. Further studies should investigate which spinal cord circuits are affected by these descending inhibitory projections." @default.
- W2078561543 created "2016-06-24" @default.
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- W2078561543 date "2011-10-01" @default.
- W2078561543 modified "2023-10-17" @default.
- W2078561543 title "Inhibitory descending rhombencephalic projections in larval sea lamprey" @default.
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- W2078561543 doi "https://doi.org/10.1016/j.neuroscience.2011.08.017" @default.
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