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Related Concept Videos

Larynx01:21

Larynx

The human larynx, often referred to as the voice box, is an intricate organ located in the neck. It serves as a pathway for air to enter the lungs during respiration and is an essential component of voice production.
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The larynx consists of various components, including cartilage, muscles, and vocal cords. Its structure includes three large unpaired cartilages—the thyroid, cricoid, and epiglottis—and three smaller paired cartilages—the arytenoids, corniculates, and...
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Physical Assessment of the Respiratory Tract IV: Auscultation

Auscultation is a crucial component of the physical assessment of the respiratory tract. It offers valuable insights into airflow through the bronchial tree and potential lung obstructions. This process involves careful listening to breath, voice, and adventitious sounds, which can reveal a wealth of information about a patient's respiratory health.
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In assessing respiratory abnormalities, palpation and auscultation are critical tools for detecting and interpreting various pathophysiological changes. These techniques provide insight into underlying disorders by evaluating tactile sensations and sounds produced by the respiratory system.
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Chronic Pharyngitis01:23

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Chronic pharyngitis refers to persistent inflammation of the pharyngial mucosa.
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Anatomy of Respiratory System I: Upper Respiratory Tract

The upper respiratory tract plays a vital role in the respiratory system, comprising several structures that facilitate air intake and prepare air for the lungs. It also serves as the first line of defense against pathogens and particles. This tract includes the nose and nasal cavity, the oral cavity, the paranasal sinuses, and the pharynx, each with specific functions and features.
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Respiratory system abnormalities are a significant concern in healthcare due to their potential to indicate underlying severe conditions like Chronic Obstructive Pulmonary Disease (COPD), asthma, and pneumonia. These abnormalities can often be detected through physical examination methods like inspection and percussion.
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The phonation critical condition in rectangular glottis with wide prephonatory gaps.

Chao Tao1, Jack J Jiang

  • 1Department of Surgery, Division of Otolaryngology Head and Neck Surgery, University of Wisconsin Medical School, Madison, Wisconsin 53792-7375, USA.

The Journal of the Acoustical Society of America
|March 19, 2008
PubMed
Summary

The modified one-mass model shows phonation threshold pressure is insensitive to glottal width. Phonation threshold flow, however, increases with glottal gap, making it a better measure for assessing voice conditions.

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Area of Science:

  • Acoustics
  • Biomechanics
  • Speech Science

Background:

  • The one-mass model is a fundamental tool for studying vocal fold dynamics.
  • Understanding phonation threshold conditions is crucial for diagnosing voice disorders.
  • Pressure recovery at the glottal exit is a known aerodynamic phenomenon.

Purpose of the Study:

  • To modify the one-mass model by incorporating pressure recovery at the glottal exit.
  • To analyze the phonation threshold pressure and flow using the modified model and small-amplitude oscillation theory.
  • To investigate the sensitivity of phonation threshold parameters to prephonatory glottal width.

Main Methods:

  • Modification of the one-mass model to include glottal exit pressure recovery.
  • Application of small-amplitude oscillation theory to analyze phonation threshold conditions.
  • Theoretical analysis of the relationship between prephonatory glottal width and phonation threshold parameters.

Main Results:

  • Phonation threshold pressure shows low sensitivity to prephonatory glottal width at wide glottal gaps.
  • This insensitivity may be attributed to the pressure recovery effect at the glottal exit.
  • Phonation threshold flow significantly increases with prephonatory glottal gap, even at wide gaps.

Conclusions:

  • The modified model provides new insights into phonation dynamics.
  • Phonation threshold flow is a more advantageous parameter than pressure for assessing wide glottal gaps.
  • Phonation threshold flow can serve as a valuable aerodynamic measure for pathological voice conditions with incomplete glottal closure.