Pyramidal tract and corticospinal neurons with branching axons to the dorsal column nuclei of the cat

Neuroscience
Luis MartinezAntonio Canedo

Abstract

Extracellular single activity was recorded from pericruciate neurons in anaesthetized, paralysed, artificially ventilated cats. A total of 309 neurons were identified antidromically by stimulation of the dorsal column nuclei (229 from the nuneate nucleus and 80 from the gracile nucleus). The study addressed the question whether pericruciate-dorsal column nuclei neurons (corticonuclear cells) sent collaterals to the ipsilateral red nucleus and/or to the contralateral nucleus reticularis gigantocellularis. Also, the ipsilateral pyramidal tract was stimulated at mid-olivary level, as was the crossed corticospinal tract at C2, Th2 and L2 levels in order to know whether the corticonuclear cells sent their axons to the spinal cord and if so to which level. It was found that more than 95% of the corticonuclear fibres coursed through the pyramidal tract. A significant (28.4%; 88/309) proportion of the the corticonuclear neurons sent collaterals to the red nucleus and/or to the nucleus reticularis gigantocellularis. About 68% (209/309) of the corticonuclear cells did not send their axons to the spinal cord and the remainder were corticospinal neurons. Most of the corticospinal fibres terminated at the cervical level (72/100) and the rem...Continue Reading

References

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Citations

Oct 8, 1999·Journal of Neurobiology·R G HendersonS A Tobet
Apr 25, 2006·Journal of Computational Neuroscience·Eduardo SánchezAntonio Canedo
Feb 1, 1997·Progress in Neurobiology·Antonio Canedo
May 9, 2000·Neuroscience·Antonio CanedoJuan Aguilar
Aug 28, 1999·Neuroscience·J MarinoAntonio Canedo
Sep 18, 2010·Journal of the American College of Nutrition·Chandan K SenSavita Khanna
Jun 7, 2003·Network : Computation in Neural Systems·Eduardo SánchezAntonio Canedo
Sep 29, 2005·Neuroreport·Kevin SinchakPaul Micevych
Jun 8, 2001·News in Physiological Sciences : an International Journal of Physiology Produced Jointly by the International Union of Physiological Sciences and the American Physiological Society·Jorge MariñoAntonio Canedo
Oct 5, 2002·Journal of Neurophysiology·Stephan R Williams, C Elaine Chapman

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