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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.
Anatomy of the Larynx
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...
Pressure Relationships in Thoracic Cavity01:24

Pressure Relationships in Thoracic Cavity

Breathing, otherwise known as pulmonary ventilation, is the process of air movement into and out of the lungs. The main mechanisms propelling pulmonary ventilation are atmospheric pressure (Patm), intra-pulmonary (Ppul ) or intra-alveolar pressure (Palv) within the alveoli, and intrapleural pressure (Pip) within the pleural cavity.
Breathing Mechanisms
Both intra-alveolar and intrapleural pressures rely on specific lung properties. The ability to breathe—allowing air to enter the lungs during...
Respiratory System Abnormal Finding II: Palpation and Auscultation01:31

Respiratory System Abnormal Finding II: Palpation and Auscultation

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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Physical Assessment of the Respiratory Tract IV: Auscultation01:28

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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Breath sounds are categorized into vesicular, bronchovesicular, and bronchial.
Pulmonary Ventilation: Inhalation01:24

Pulmonary Ventilation: Inhalation

Pulmonary ventilation is a vital process that ensures the exchange of oxygen and carbon dioxide in the lungs. It refers to the movement of air into and out of the lungs, enabling the body to obtain oxygen and remove waste carbon dioxide. In this article, we will explore the intricacies of pulmonary ventilation, including its underlying principles, mechanisms, and the interplay of pressures within the respiratory system.
Boyle's law becomes particularly pertinent when examining respiratory...
Physical Assessment of the Respiratory Tract III: Percussion01:29

Physical Assessment of the Respiratory Tract III: Percussion

The respiratory system, fundamental to life, consists of complex structures responsible for gas exchange. The percussion assessment is critical to understanding this system's health and functionality. This non-invasive assessment technique allows healthcare providers to evaluate the density or aeration of the lungs, thereby identifying potential abnormalities.
Percussion in Respiratory Assessment
Percussion evaluates underlying tissue composition with audible and tactile vibrations,...

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Ventricular pressures in phonating excised larynges.

Fariborz Alipour1, Ronald C Scherer

  • 1Department of Communication Sciences & Disorders, The University of Iowa, 334E WJSHC, Iowa City, Iowa 52242-1012, USA. alipour@iowa.uiowa.edu

The Journal of the Acoustical Society of America
|August 17, 2012
PubMed
Summary

Air pressure in the laryngeal ventricle is primarily influenced by false vocal fold (FVF) movement, not true vocal fold (TVF) vibration. FVF motion significantly impacts intraventricular pressure dynamics.

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Area of Science:

  • Laryngeal Physiology
  • Aeroacoustics
  • Vocal Fold Biomechanics

Background:

  • The laryngeal ventricle's role in vocalization is not fully understood.
  • Previous studies have focused on true vocal fold (TVF) function, often overlooking false vocal fold (FVF) contributions.

Purpose of the Study:

  • To investigate the aeroacoustic properties of the laryngeal ventricle.
  • To determine the influence of true vocal fold (TVF) and false vocal fold (FVF) adduction on intraventricular pressure.

Main Methods:

  • Excised canine larynges were used to measure laryngeal ventricle pressure.
  • Pressure was recorded using a beveled needle connected to a transducer.
  • Measurements were taken under varying adduction levels of TVFs and FVFs, and with different subglottal pressures (Ps).
  • Electroglottography was employed to assess tissue contact.

Main Results:

  • Intraventricular air pressures are strongly correlated with false vocal fold (FVF) motion, not true vocal fold (TVF) vibration.
  • Both DC and AC pressures in the ventricle are dependent on FVF adduction, motion amplitude, and contact.
  • Ventricle pressures reached up to 65% of subglottal pressures (Ps) during large-amplitude FVF vibration with contact.
  • FVF medial movement can generate positive pressure pulses in Ps due to increased laryngeal flow resistance.

Conclusions:

  • The laryngeal ventricle functions as an independent aero-acoustic chamber.
  • False vocal fold (FVF) dynamics are the primary determinant of pressure within the laryngeal ventricle.