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Perinatal development of laryngeal function.

R Harding

    Journal of Developmental Physiology
    |June 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    In fetal sheep, laryngeal muscles control upper airway resistance, especially during non-rapid-eye-movement sleep. This muscle activity is crucial for maintaining lung expansion and development.

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    Area of Science:

    • Respiratory Physiology
    • Fetal Development
    • Laryngeal Muscle Function

    Background:

    • Upper airway resistance is significantly modulated by laryngeal muscle activity.
    • Adductor muscles play a key role in opposing lung recoil, particularly during non-rapid-eye-movement sleep.
    • Fetal laryngeal muscle function is influenced by sleep states and breathing patterns.

    Purpose of the Study:

    • To investigate the role of laryngeal muscles in regulating upper airway resistance in developing sheep.
    • To test the hypothesis that tonic activity of laryngeal adductor muscles contributes to elevated tracheal pressures during fetal apnea.

    Main Methods:

    • Observation of laryngeal muscle activity in developing sheep, focusing on sleep states.
    • Experimental manipulation including fetal paralysis and recurrent laryngeal nerve section in near-term fetal sheep.

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    Main Results:

    • Laryngeal adductor muscles are tonically active during non-rapid-eye-movement sleep in fetal sheep.
    • This tonic activity appears to elevate tracheal pressures and reduce tracheal fluid flow during periods of apnea.
    • Experiments support the significant contribution of the larynx to upper airway resistance in the near-term fetus.

    Conclusions:

    • The larynx is a major determinant of upper airway resistance in the near-term fetus.
    • Laryngeal muscle activity is essential for maintaining pulmonary expansion, which influences lung development.
    • Understanding fetal laryngeal function is critical for comprehending respiratory control and lung maturation.