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Vestibular influences on the autonomic nervous system
1Department of Otolaryngology, University of Pittsburgh, Pennsylvania 15213, USA. byates@pop.pitt.edu
Annals of the New York Academy of Sciences
|June 19, 1996
Summary
The vestibular system, particularly otolith organs sensing pitch, significantly influences sympathetic and respiratory functions in cats. These connections help maintain homeostasis during postural changes.
Area of Science:
- Neuroscience
- Physiology
Background:
- The vestibular system modulates central nervous system outflow.
- Otolith organs are implicated in vestibulo-sympathetic and vestibulo-respiratory responses.
Purpose of the Study:
- To investigate the role of otolith organs in mediating vestibular influences on sympathetic and respiratory systems.
- To identify the neural pathways involved in these vestibulo-autonomic interactions.
Main Methods:
- Studies were conducted on cats, focusing on responses to pitch rotations.
- Neural pathways were traced within the vestibular nuclear complex and to spinal cord targets.
Main Results:
- Otolith organs responding to pitch rotations predominantly influence vestibulo-sympathetic and vestibulo-respiratory responses.
- Vestibular influences on respiration and circulation are mediated by specific regions within the medial and inferior vestibular nuclei.
- Vestibular signals reach sympathetic preganglionic neurons via cardiovascular regulatory pathways.
- Vestibular effects on respiratory motoneurons involve neural circuits not typically associated with breathing generation.
Conclusions:
- Vestibular system plays a crucial role in maintaining homeostasis during postural changes by influencing sympathetic and respiratory systems.
- Specific vestibular nuclei and distinct neural pathways mediate these autonomic responses.