Descending pathways mediating disynaptic excitation of dorsal neck motoneurones in the cat: facilitatory interactions

Neurosci Res. 1992 Oct;15(1-2):32-41. doi: 10.1016/0168-0102(92)90015-5.

Abstract

Facilitatory interactions between disynaptic EPSPs evoked from the contralateral tectum, ipsilateral tegmentum and contra- and/or ipsilateral pyramid have been investigated in dorsal neck motoneurones of the cat. Monosynaptic convergence on common intercalated neurones was found from ipsi- and contralateral pyramidal, contralateral tectal and ipsilateral tegmental fibres. In addition, disynaptic facilitation was observed from ipsilateral pyramidal fibres on disynaptic contralateral pyramidal EPSPs. Transection of cortico-fugal fibres in the pyramid showed that the location of the interactions occurred in the lower brain stem, suggesting that reticulospinal neurones are mediating the effects.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Afferent Pathways / anatomy & histology
  • Afferent Pathways / physiology*
  • Animals
  • Cats
  • Electric Stimulation
  • Evoked Potentials / physiology
  • Motor Neurons / physiology*
  • Neck Muscles / innervation*
  • Neck Muscles / physiology
  • Pyramidal Tracts / cytology
  • Pyramidal Tracts / physiology
  • Stereotaxic Techniques
  • Superior Colliculi / physiology
  • Synapses / physiology*