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Iizuka, M. et al.

Iizuka, Nishimaru, Kudo,

Development of the spatial pattern of 5-HT-induced locomotor rhythm in the lumbar spinal cord of rat fetuses in vitro.

Developmental changes in the 5-hydroxytryptamine (5-HT)-induced locomotor rhythm were examined in isolated spinal cord preparations taken from fetal rats at embryonic day (E) 16.5, E18.5 and E20. 5. Motor activity was recorded from L2/L3 and L5 ventral roots. Bath application of 5-HT evoked rhythmic bursts that were synchronized in all ventral roots studied at E16. 5. At E18.5, 5-HT evoked rhythmic bursts that alternated between the two sides, while the bursts in the L2/L3 ventral root were synchronous with those in the ipsilateral L5 ventral root. At E20.5, 5-HT evoked alternate rhythmic bursts in L2/L3 and L5 ventral roots, representing activity in flexors and extensors, respectively. In the presence of strychnine, 5-HT induced rhythmic bursts that were synchronized in all ventral roots studied at E18.5 and E20.5, suggesting that the change in the pattern of rhythmic motor activity that occurs with age is due to the development of glycine-mediated inhibition.[1]

References

Development of the spatial pattern of 5-HT-induced locomotor rhythm in the lumbar spinal cord of rat fetuses in vitro. Iizuka, M., Nishimaru, H., Kudo, N. Neurosci. Res. (1998) [Pubmed]

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