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Phonation and Laryngeal Anatomy and Physiology PowerPoint Presentation

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This medical PowerPoint presentation tells us how phonation is the process of sound production in humans that involves the vibration of the vocal folds located in the larynx.

Phonation is the process of sound production in humans, which involves the vibration of the vocal folds located in the larynx or voice box. The larynx is an organ located in the neck, between the trachea and the base of the tongue, that is involved in several functions including speech production, protection of the airways, and breathing.

The larynx is composed of several structures, including the thyroid cartilage, cricoid cartilage, arytenoid cartilages, and vocal folds. The thyroid cartilage is the largest cartilage in the larynx and is commonly referred to as the "Adams apple." The cricoid cartilage is a ring-shaped cartilage that sits below the thyroid cartilage and forms the base of the larynx. The arytenoid cartilages are small, pyramid-shaped structures that sit on top of the cricoid cartilage and are responsible for controlling the position and tension of the vocal folds. The vocal folds, also known as vocal cords, are two thin, elastic bands of muscle tissue that stretch across the larynx.

During phonation, the vocal folds are brought together and air from the lungs is forced through them, causing them to vibrate and produce sound. The pitch of the sound is determined by the tension of the vocal folds, which is controlled by the muscles attached to the arytenoid cartilages. The loudness of the sound is determined by the force of the air passing through the vocal folds, which is controlled by the muscles involved in breathing.

Several muscles are involved in the movement and control of the larynx and vocal folds, including the cricothyroid muscle, thyroarytenoid muscle, and posterior cricoarytenoid muscle. The cricothyroid muscle is responsible for increasing the tension of the vocal folds, which raises the pitch of the voice. The thyroarytenoid muscle is responsible for decreasing the tension of the vocal folds, which lowers the pitch of the voice. The posterior cricoarytenoid muscle is responsible for opening the vocal folds, allowing air to pass through and facilitating breathing.

Tags : Phonation, larynx, sound production in humans, vocal folds, voice box

Published on : Jun 23, 2023 | Views : 1457 | Downloads : 1

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Slide 1-

Phonation andLaryngeal Anatomy and Physiology Nothing is ever said on the stage without a reason. There are no exceptions. Charles Waxberg
Slide 2-

The original use of the larynx was to keep us alive through breakfast. Its main function is stop solids and liquids from entering the trachea and choking us to death. Its secondary functions are to bear down, phonation and speech. The larynx of humans and great apes in infancy is higher in the neck so that they can breathe and suckle at the same time. In humans it descends before the age of two.
Slide 3-

What the Larynx is for To stop food/liquid from entering the lungs To Bear Down While Expelling Defecation Childbirth While Lifting PHONATION
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What is phonation? Laryngeal generation of voice
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Composition of the Larynx Composed of cartilage: Cricoid Cartilage – Greek Name meaning ‘ring like’ Thyroid Cartilage – Greek Name meaning ‘Sheild like’ A pair of Arytenoids Epiglottis
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Laryngeal Anatomyanatomy.uams.edu/anatomyhtml/atlas_html/rsa3p2.html 1. Hyoid bone 2. Thyroid cartilage 3. Cricoid cartilage 4. Tracheal cartilages
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www.bartleby.com/107/illus952.html
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www.ling.yale.edu:16080/ling120/Larynx/Larynx_side.gif Larynx
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Cricoidanatomy.uams.edu/.../atlas_html/rsa3p6.html Anterior arch Posterior lamina Articular facet
Slide 11-

Thyroid Cartilage /www.yorku.ca/earmstro/journey/images/thyroid.gif
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ARYTENOIDShomepages.wmich.edu/~gunderwo/intro_voice.htm
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1. Thyroid prominence 2. Cricothyroid ligament 3. Arytenoid cartilage 4. Corniculate cartilage 5. Vocal ligament 6. Vestibular fold 7. Cricoid cartilage 8. Articular facet for inferior cornu of thyroid cartilage anatomy.uams.edu/anatomyhtml/graphics/rsa3p8.gif
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Epiglottis Arytenoid cartilage Corniculate cartilage Aryepiglottic fold anatomy.uams.edu/anatomyhtml/graphics/rsa3p10.gif
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The thyroid rests superiorly on the cricoid and attaches posterior-laterally at the cricoid’s inferior articulator facets. This attachment (the cricothyroid joint) hinges the cricoid and thyroid allowing their anterior sides to adduct, changing vocal fold length.
Slide 16-

Movement The arytenoid cartilages, two pyramid shaped cartilages rest on the cricoid at the cricoarytenoid joints and move in two distinct ways: 1.) To pivot (rocking) the posterior ends of the arytenoids away from each other, adducting the anterior ends or the reverse so the anterior ends abduct, and… 2.) Sliding the arytenoids on an anterior-posterior path. Since the vocal folds are attached to the anterior ends of these cartilages (at the vocal process) any movement in them will change the folds’ shape, tension and relationship to each other thereby affecting phonation.
Slide 17-

people.umass.edu/jkingstn/ling414/figure%202.19%20arytenoid%20movement%20f05.jpg
Slide 18-

Composition of the Larynx (Con’t) Composed of Muscle: Extrinsic Laryngeal Muscles Intrinsic Laryngeal Muscles
Slide 19-

Extrinsic Muscle TWO Groups of Extrinsic Muscles: Suprahyoids – Attach to points above the Hyoid (Jaw, Skull and Tongue) when they contract they raise or elevate the Larynx eg Swallowing Infrahyoids – Attach to points below the Hyoid (one connects to the thyroid, however the others connect to the sternum and the scapula) when they contract they lower or depress the Larynx
Slide 20-

www.sloan-studios.com/pm/teachingtools.htm
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Intrinsic Muscles Adductors – vocal folds are together Abductors – vocal folds apart Tensors - Stiffen Relaxors - Relax
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Adductors Lateral Cricoarytenoids Interarytenoids Transverse Arytenoids Oblique Arytenoids
Slide 24-

Adductors artemis.austincollege.edu/acad/music/wcrannell/vocalped/images/larynx1.gif
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Adductors artemis.austincollege.edu/acad/music/wcrannell/vocalped/images/larynx1.gif
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137.222.110.150/calnet/H+N/image/deep%20muscles%20of%20larynx-lateral%20view.jpg
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Abductors Posterior Cricoarytenoids
Slide 28-

Vocal Folds Muscle External Thyroarytenoids – inserts into the muscular process on the Arytenoids and the Thyroid notch (shorten and adduct) Internal Thyroarytenoids – inserts into the vocal process on the Arytenoids and the Thyroid Notch (shortens and stiffens), act antagonistically to the Cricothyroids Membrane
Slide 29-

137.222.110.150/calnet/H+N/image/deep%20muscles%20of%20larynx-lateral%20view.jpg
Slide 30-

Membranes False Vocal Folds – Ventricular folds Laryngeal Ventricle Conus Elasticus (interconnects the thyroid, cricoid and arytenoids cartilages) Lamina propria (mucosal cover of the vocalis muscle) – can vibrate independently of the vocalis muscle Vocal Ligament – the thread like collagenous fibers of the deep layer of the lamina propria
Slide 31-

Relaxors and Tensors External Thyroarytenoid – Relaxor, shortens and adducts Internal Thyroarytenoid – Tensor, shortens and stiffens Cricothyroid Muscles – Tensor, lengthens and stiffens Pitch is determined by Relaxors and Tensors
Slide 32-

www.kolumbus.fi/msts/larynx/larynx.htm
Slide 33-

Fundamental Frequency Phonation is made up of a fundamental frequency or Fo (the number of times the folds open and close per second-CPS) and harmonic multiples of the Fo (two times the Fo, three times, four times etc.) that fall in intensity (volume) in an inverse relationship as the harmonics rise in frequency or as the pitch rises the volume falls.
Slide 34-

Fundamental Frequency INTENSITY (VOLUME) FREQUENCY (PITCH)
Slide 35-

Pitch Fundamental frequency (average: baby 500Hz, children 250-400Hz men 125Hz women 200Hz) is primarily affected by applying more or less longitudinal tension to the VF using: Cricothyroids Tension in the vocalis muscle OR Adjustments in vertical tension – depressing or elevating the Larynx via suprahyiod and infrahyoid muscles
Slide 36-

Vocal Fold Tension, Elasticity and Movement Thicker or thinner Shorter or longer Open or close Intermediate positions Stiff or elastic Movement: Bronx Cheer or Raspberry– “the sound is that or air escaping in rapid bursts, not the sound of the lips moving” – Borden and Harris. Aerodynamic forces acting on the elastic body of the lips
Slide 37-

ADMET – Aero Dynamic Myo-Elastic Theory Glottal vibration is the result or refers to interaction between aero-dynamic forces and vocal fold muscular action. Sub-Glottal Pressure Bernoulli Effect – set vocal folds into vibration due to the elasticity of the folds (elastic recoil – the force which restores any elastic body back to its resting place) Muscular Force – Muscles act to bring the folds together so they can vibrate, and muscles regulate their thickness and tension to alter fundamental frequency. Folds are FULLY or PARTIALLY ADDUCTED for phonation
Slide 38-

Bernoulli Effect An increase in velocity results in a drop in the pressure exerted by the molecules of moving gas or liquid, the pressure drops being perpendicular the direction of the flow
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Slide 40-

Glottal Cycle Vertical Phase Difference – vocal folds open at the bottom first. As top part opens bottom part closes. Wave like motion
Slide 41-

www.phon.ox.ac.uk/~jcoleman/phonation.htm
Slide 42-

Chest (Modal Register) Low fundamental frequency Vocalis muscle activity Folds are thick and short Low stiffness
Slide 43-

Falsetto Register Longer and thinner folds Stiff folds Small amplitude of vibration Incomplete closure of the folds Shutter like appearance – Vibrate more like strings
Slide 44-

Vocal Onset How we bring the folds together: Attack Breathy Vocal Fry Partial adduction – Whispering or falsetto register (Note: Folds come together FULLY but without force for Modal register)
Slide 45-

Pitch Lies in the stiffness of the folds resulting from lengthening and contraction of the thyroarytenoids, especially the vocalis portion