Tectal input to the central posterior/prepacemaker nucleus of weakly electric fish, Apteronotus leptorhynchus: an in vitro tract-tracing study

Brain Research
G K Zupanc, I Horschke

Abstract

The weakly electric fish Apteronotus leptorhynchus produces electric organ discharges which are highly stable in waveform and frequency. Short-term modulations of these discharges, typically displayed during social interactions, are controlled by the prepacemaker nucleus (PPn). Neurons of this thalamic cell group intermingle with cells of the central posterior nucleus (CP) to form a complex called 'CP/PPn'. By employing in vitro tract-tracing techniques, we have, in the present investigation, demonstrated that this complex receives input from the tectum opticum. The tectal input is mediated by varicose fibers forming an elongated stripe at the ventral rim of the CP/PPn. As suggested by retrograde tracing from the CP/PPn, this projection is likely to arise from 'multipolar cells with an ascending axon' previously characterized in a Golgi study [14]. As this tectal cell type has been shown to be predominantly driven by electrosensory stimuli [6], information arising from these cells may be used in controlling modulations of the electric organ discharges.

References

Sep 22, 1992·The Journal of Comparative Neurology·G K Zupanc, W Heiligenberg
Jan 1, 1991·Journal of Chemical Neuroanatomy·L MalerW Ellis
May 1, 1986·Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology·G Rose, W Heiligenberg
Mar 1, 1974·The Journal of Comparative Neurology·H VanegasJ Amat
May 26, 1980·Brain Research·R G Northcutt, A B Butler

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Citations

Oct 10, 1998·Brain Research. Brain Research Protocols·G K Zupanc
Mar 21, 2012·The Journal of Comparative Neurology·Ana C C GiassiLeonard Maler

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