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Olfactory modulation of hypoglossal neuron activity

O Mameli1, F Melis

  • 1Institute of Human Physiology, University of Sassari, Italy.

Archives Italiennes De Biologie
|April 1, 1993
PubMed
Summary

Olfactory stimulation affects hypoglossal nerve activity, influencing tongue movements. These olfactory inputs, interacting with visual stimuli, help prepare the mouth for food reception during digestion.

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Area of Science:

  • Neuroscience
  • Olfactory System Research
  • Sensory Integration

Background:

  • The hypoglossal nucleus (XIIth nucleus) controls tongue movements crucial for functions like feeding.
  • Interactions between olfactory and visual sensory systems and their influence on motor nuclei are not fully understood.

Purpose of the Study:

  • To investigate the effects of olfactory stimulation on hypoglossal neurons.
  • To explore the convergence of olfactory and visual inputs within the hypoglossal nucleus.
  • To understand the role of olfactory input in modulating hypoglossal function related to feeding.

Main Methods:

  • Stimulation of olfactory neuroepithelial cells using amyl acetate.
  • Recording of electrical activity in the olfactory bulb and hypoglossal neurons.
  • Analysis of response patterns (excitation, inhibition) to varying olfactory stimulation intensities.
  • Assessment of interactions between olfactory and visual stimuli on hypoglossal activity.

Main Results:

  • Amyl acetate stimulation elicited significant responses in the olfactory bulb and modulated hypoglossal neuron activity.
  • Olfactory stimulation induced diverse response patterns (excitation, inhibition, combined) in hypoglossal neurons, intensity-dependent.
  • Olfactory inputs converged with visual inputs in the XIIth nucleus, modulating responses to photic stimulation.
  • Olfactory inputs altered the excitatory and inhibitory effects of visual stimuli on hypoglossal neurons.

Conclusions:

  • Olfactory inputs significantly influence hypoglossal neuronal activity.
  • Convergence of olfactory and visual pathways in the XIIth nucleus suggests integrated sensory processing.
  • Olfactory stimulation, alone or with visual input, can induce tongue reflex adjustments for food reception, preparing the oral cavity for digestion.

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