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Related Experiment Videos

Structure-function relationships in rat brain stem subnucleus interpolaris. IX. Inputs from subnucleus caudalis.

B H Hallas1, M F Jacquin

  • 1Department of Anatomy, New York College of Osteopathic Medicine, Old Westbury 11568.

Journal of Neurophysiology
|July 1, 1990
PubMed
Summary

The trigeminal subnucleus interpolaris (SpVi) shows altered receptive-field properties after subnucleus caudalis (SpVc) input removal. Lesions significantly increased convergence, responsiveness to non-orofacial stimuli, and receptive field size in SpVi neurons.

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Area of Science:

  • Neuroscience
  • Sensory Physiology
  • Trigeminal System Research

Background:

  • The spinal trigeminal nucleus interpolaris (SpVi) receives input from various trigeminal subnuclei, influencing its receptive-field (RF) properties.
  • The role of the adjacent subnucleus caudalis (SpVc) projection in modulating SpVi neuronal activity was previously unclear.

Purpose of the Study:

  • To investigate the functional impact of SpVc input on SpVi neuronal RF properties.
  • To determine if SpVc modulates SpVi responses to orofacial and non-orofacial stimuli.

Main Methods:

  • Surgical isolation of SpVc from SpVi using knife-cut lesions in rats.
  • Selective lesioning of SpVc inputs to SpVi using kainic acid injections.
  • Electrophysiological recordings and RF mapping of SpVi neurons.

Related Experiment Videos

  • Comparison of lesioned groups with normal control rats.

    • Main Results:

    • Knife-cut and kainic acid lesions of SpVc produced similar, significant alterations in SpVi cell response characteristics.
    • Increased convergence from multiple receptor organs, reduced mechanical responsiveness, tonic responses, spontaneous activity, directional sensitivity, and split RFs were observed.
    • Receptive fields of whisker-activated neurons were significantly larger post-lesion, with increased multi-whisker responsiveness.

    Conclusions:

    • Spinal trigeminal subnucleus caudalis (SpVc) plays a crucial role in shaping the receptive-field properties of spinal trigeminal subnucleus interpolaris (SpVi) neurons.
    • Removal of SpVc input leads to a less specific and more broadly responsive SpVi neuronal population.
    • These findings highlight the importance of inter-subnuclear connections in trigeminal sensory processing.