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Sympathetic signaling, a vital part of the autonomic nervous system, plays a crucial role in mobilizing the body's resources in response to stress or emergencies. It involves the transmission of nerve impulses from sympathetic preganglionic fibers to postganglionic fibers. This results in the release of specific neurotransmitters and activation of adrenergic receptors.
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The vestibular system is a set of inner ear structures that provide a sense of balance and spatial orientation. This system is comprised of structures within the labyrinth of the inner ear, including the cochlea and two otolith organs—the utricle and saccule. The labyrinth also contains three semicircular canals—superior, posterior, and horizontal—that are oriented on different planes.
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Vestibulo-sympathetic responses.

Bill J Yates1, Philip S Bolton, Vaughan G Macefield

  • 1Departments of Otolaryngology and Neuroscience, University of Pittsburgh, Pittsburgh, Pennsylvania.

Comprehensive Physiology
|April 10, 2014
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Summary
This summary is machine-generated.

The vestibular system, specifically otolith organs, regulates blood pressure during movement and posture changes. These vestibulosympathetic reflexes differ between species and can be influenced by cognitive factors.

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Area of Science:

  • Neuroscience
  • Cardiovascular Physiology
  • Vestibular System

Background:

  • The vestibular otolith organs play a role in blood pressure control during postural changes and movement.
  • Gravity's effect on body axis and blood distribution is significant during posture changes.

Purpose of the Study:

  • To review evidence on vestibular system's regulation of blood pressure.
  • To explore vestibulosympathetic reflexes, their mechanisms, and interspecies differences.
  • To discuss the influence of cognition on these reflexes.

Main Methods:

  • Review of accumulated evidence over 30 years from animal and human studies.
  • Analysis of neurophysiological and neuroanatomical studies.
  • Examination of findings on cognition's effect on vestibulosympathetic responses.

Main Results:

  • Vestibular otolith organs contribute to blood pressure control during movement and posture changes.
  • Vestibulosympathetic reflexes are distinct from other cardiovascular reflexes and can precede blood distribution changes.
  • Differences exist in vestibulosympathetic reflex expression between humans and animals, with patterned responses observed in animals.
  • Specific neurons mediating these reflexes identified in the brainstem.
  • Cognition can modulate the gain of vestibulosympathetic responses.

Conclusions:

  • The vestibular system is a critical regulator of blood pressure, especially during dynamic activities.
  • Understanding vestibulosympathetic reflexes offers insights into cardiovascular control and potential therapeutic targets.
  • Neural pathways involving the cerebellum and brainstem nuclei are implicated in adaptive plasticity of these reflexes.