Speech Science- Larynx/vocal folds anatomy

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lec 7

Last updated 3:33 AM on 10/1/26
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22 Terms

1
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laryx

controls airflow in/out of lungs, provides source of speech

protects from foreign bodies aids during swallow

increases intrathoracic pressure during exertion,coughing,valsalva maneuver, etc

2
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cartilages of larynx-unpaired

  • thryoid cartilage

  • cricoid cartilage

  • epiglottis


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cartilages of larynx-paired

  • arytenoids

  • corniculates

  • cuneiform


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cricothyroid joint-movable joint

connects the thyroid and cricoid cartilage together

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cricoarytenoid joint-movable joint

connects the arytenoid and cricoid cartilage together

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intrinsic muscles

interconnect cartilages, fine control of phonation

ALL PAIRED

-abduction: posterior cricoarytenoid

-adducation: lateral cricoarytenoid, transverse & oblique arytenoids

tensor,relaxor

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extrinsic muscles

adjust and stabilize overall laryngeal position so that instrinic muscles can exert their forces

suprahyoid: elevate hyoid/larynx

infrahyoid: pull hyoid/larynx down

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interarytenoid muscles/intrinsic adductors

  • oblique

  • transverse


<ul><li><p>oblique</p></li><li><p>transverse</p></li></ul><p></p>
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LCA-intrinsic adductors

lateral cricoarytenoid

<p>lateral cricoarytenoid</p>
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PCA-intrinsic abductor

posterior cricoarytenoid muscles

<p>posterior cricoarytenoid muscles</p>
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vocal folds

true vocal folds lie inferior to false folds

separated by small cleft called the ventricle

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subglottic(below) glottic(between) supraglottic(above) regions

true folds, false folds, and ventricle divide the regions

<p>true folds, false folds, and ventricle divide the regions</p>
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glottis

space between vocal folds

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vocal fold histology

supericial to deep:

  • epithelium (0.1mm thick)

  • lamina propia

    • superficial aka reinke’s space: gelatin 0.5mm thick

    • intermediate: elastin 1-2mm thick

    • deep: collagen

  • muscle


<p>supericial to deep: </p><ul><li><p>epithelium (0.1mm thick)</p></li><li><p>lamina propia </p><ul><li><p>superficial aka reinke’s space: gelatin 0.5mm thick</p></li><li><p>intermediate: elastin 1-2mm thick</p></li><li><p>deep: collagen</p></li></ul></li><li><p>muscle</p></li></ul><p></p>
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true vocal folds

  • mucosa

  • muscle (thyroarytenoid)


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3 major layers “body-cover model”

  • cover: epitheluim and superficial lamina propia

  • transition: intermediate and deep lamina propria

  • body: vocalis muscle


<ul><li><p>cover: epitheluim and superficial lamina propia </p></li><li><p>transition: intermediate and deep lamina propria</p></li><li><p>body: vocalis muscle</p></li></ul><p></p>
17
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theories of voice production

  • the vibrating string theory- rejected

  • neurochronaxic theory-rejected

  • myoelastic aerodynamic theory of voice production


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1741 Ferrein

The vibrating string theory
rejected

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1950 Husson

neurochronaxic theory

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1958 van den berg (propoed first by muller 1843)

Myoelastic-aerodynamic theory of voice production

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Myo-elastic Aerodynamic Theory of phonation

THE VOCAL FOLDS ARE ACTIVATED BY THE AIRSTREAM FROM THE LUNGS
Myo-: Muscles adduct vocal folds, establish levels of tension and elasticity
Elasticity: Allows vocal folds to stretch and return in each cycle

<p><span style="color: rgb(246, 232, 232);">THE VOCAL FOLDS ARE ACTIVATED BY THE AIRSTREAM FROM THE LUNGS<br>Myo-: Muscles adduct vocal folds, establish levels of tension and elasticity<br>Elasticity: Allows vocal folds to stretch and return in each cycle</span></p>
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vocal fold vibration results from the interaction between

vocal fold muscler forces

aerodynamic forces