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Related Experiment Videos

Respiratory muscle control during vomiting.

A D Miller1

  • 1Rockefeller University, New York, NY 10021.

Canadian Journal of Physiology and Pharmacology
|February 1, 1990
PubMed
Summary
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Vomiting involves coordinated respiratory muscle actions, with expiratory muscles activating during expulsion. Medullary neurons control these muscles, but pathways for inspiratory muscles remain unclear.

Area of Science:

  • Neuroscience
  • Respiratory Physiology

Background:

  • Vomiting involves complex coordination of thoracic and abdominal pressures generated by respiratory muscles.
  • The roles of specific respiratory muscles and their neural control during vomiting are not fully understood.

Purpose of the Study:

  • To investigate the neural control of respiratory muscles during vomiting.
  • To identify the involvement of medullary respiratory neurons in coordinating muscle activity during vomiting.

Main Methods:

  • Analysis of muscle activity patterns during vomiting.
  • Examination of medullary respiratory neuron firing during fictive vomiting.

Main Results:

  • Co-contraction of diaphragm and abdominal muscles occurs during vomiting expulsion.

Related Experiment Videos

  • Bulbospinal expiratory neurons activate abdominal and internal intercostal motoneurons during vomiting.
  • Pathways for phrenic and external intercostal motoneuron activation are unidentified.
  • Most bulbospinal inspiratory neurons do not activate these motoneurons during vomiting.

    • Conclusions:

    • Medullary expiratory neurons play a role in activating expiratory muscles during vomiting.
    • Relaxation of the diaphragm during vomiting may involve reduced firing of inspiratory neurons.
    • Further research is needed to elucidate the neural control of inspiratory muscles during vomiting.