Logan Steele
The human voice is a fascinating instrument, and the mechanisms that produce it are intricate and complex. The vocal folds, or vocal cords, are multilayered structures that vibrate to create our unique voices. While the diaphragm and abdominal and chest muscles coordinate airflow from the lungs, the muscles of the larynx, both intrinsic and extrinsic, play a crucial role in modulating the tone and volume of our voices. These muscles, including the cricothyroid, thyroarytenoid, and posterior cricoarytenoid muscles, control the tension and movement of the vocal folds, allowing us to produce a wide range of sounds. Understanding the intricacies of these muscles and their impact on vocal fold tension is essential for maintaining vocal health and treating voice disorders.
| Characteristics | Values |
|---|---|
| Muscles that tense vocal folds | Cricothyroid |
| Other muscles involved | Thyroarytenoid, Posterior cricoarytenoid, Lateral cricoarytenoid, Transverse arytenoid, Oblique arytenoid, Aryepiglottic |
| Muscle groups | Intrinsic and extrinsic |
| Function of intrinsic muscles | Control the shape of the rima glottidis, length and <co: 1,12,15>tension of the vocal folds |
| Function of extrinsic muscles | Elevate or depress the larynx during swallowing |
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What You'll Learn
- The cricothyroid muscle stretches and tenses vocal ligaments
- The thyroarytenoid muscle helps close the glottis and regulate tension
- The intrinsic laryngeal muscles control the shape of the rima glottidis
- The lateral cricoarytenoid muscles are the major adductors of the vocal folds
- The posterior cricoarytenoid muscles are the sole abductors of the vocal folds
The cricothyroid muscle stretches and tenses vocal ligaments
The cricothyroid muscle plays a crucial role in vocal production by stretching and tensing the vocal ligaments. This muscle originates from the anterolateral aspect of the cricoid cartilage and attaches to the inferior margin of the thyroid cartilage.
The cricothyroid muscle's ability to stretch and tense the vocal ligaments is fundamental to the creation of forceful speech and altering the tone of voice. By increasing the distance between the vocal processes and the angle of the thyroid, the cricothyroid muscle elongates and tenses the vocal folds, resulting in higher-pitched phonation. This action also increases tension in the vocal folds, which is crucial for producing sound.
The vocal folds, also known as vocal cords, are multilayered structures that consist of muscles covered by a mucosal layer. They are attached at the inside of the thyroid notch, with their front ends anchored to the front-middle (anterior commissure) and their back ends anchored to the arytenoid cartilages. The arytenoid cartilages sit atop the back of the cricoid cartilage, controlling the movement of the vocal folds through their ability to rock, glide, and pivot.
The cricothyroid muscle works in conjunction with other muscles and subsystems to regulate vocal fold tension and stiffness, influencing the pitch and volume of the voice. The thyroarytenoid muscle, for example, helps to relax the vocal ligament, resulting in a softer voice. The intrinsic and extrinsic muscles of the larynx also play a role in phonation and breathing by adjusting the individual components of the larynx and elevating or depressing it during swallowing.
The cricothyroid muscle's role in vocal production is further highlighted by its involvement in voice disorders. For instance, in the treatment of spasmodic dysphonia, botulinum toxin may be injected into the cricothyroid muscles to alleviate symptoms. Understanding the complex interplay between the cricothyroid muscle, vocal ligaments, and other vocal subsystems is essential for comprehending voice production and maintaining vocal health.
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The thyroarytenoid muscle helps close the glottis and regulate tension
The vocal folds, also known as vocal cords, are multilayered structures that consist of a muscle covered by a mucosal covering. The glottis is the space between the two vocal folds. When the vocal folds adduct, or come together, the glottis closes; when the vocal folds abduct, the glottis opens. The thyroarytenoid muscle, also known as the vocalis muscle, is the most dense portion of the vocal fold and runs its entire length.
The thyroarytenoid muscles aid in two distinct actions simultaneously. They draw the arytenoid cartilages anteriorly, allowing the vocal ligaments to shorten, thicken, and relax. At the same time, they rotate the arytenoid cartilages medially, which helps close the rima glottidis by bringing the two vocal cords together. The vocal folds will not oscillate if they are not sufficiently close to one another, are not under sufficient tension, or are under too much tension.
The glottis opens and closes during vibration. The larynx, or voice box, coordinates closing the glottis by bringing both vocal folds to the midline to prevent choking during swallowing. The voice box also adjusts vocal fold tension to vary pitch and changes in volume. The larynx splits into three distinct regions: the supraglottis, glottis, and subglottis. Within these three regions, the cartilage, neurovascular, and musculature are all intertwined to allow the larynx to function as a unit and carry out its many functions.
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The intrinsic laryngeal muscles control the shape of the rima glottidis
The intrinsic laryngeal muscles act on the individual components of the larynx, controlling the shape of the rima glottidis, which is the opening between the vocal folds and the arytenoid cartilages. The intrinsic laryngeal muscles also control the length and tension of the vocal folds. The vocal folds, also known as the vocal cords, are multilayered structures consisting of a muscle covered by a mucosal covering. They provide a valve for the airway and vibrate to produce the voice.
The rima glottidis is the narrowest part of the larynx, and it is longer in males than in females. It is subdivided into two parts: the larger anterior part between the vocal folds (glottis vocalis) and the smaller posterior part between the arytenoid cartilages (intercartilaginous part). The arytenoid cartilages sit atop the back of the cricoid cartilage and control the movement of the vocal folds. They can rock, glide, and pivot, allowing the vocal folds to adduct or abduct, which is necessary for airway protection and phonation.
The lateral cricoarytenoid muscles are the major adductors of the vocal folds, and they narrow the rima glottidis, modulating the tone and volume of speech. The transverse and oblique arytenoid muscles also adduct the arytenoid cartilages, closing the posterior portion of the rima glottidis and narrowing the laryngeal inlet. The posterior cricoarytenoid muscles, on the other hand, are the sole abductors of the vocal folds, and they widen the rima glottidis.
The vocal ligament is composed of the thyroarytenoid muscle, which helps close the glottis and regulate tension during speaking and singing. The medial portion of this muscle is called the vocalis muscle. The cricothyroid muscle, also known as the "singer's muscle," stretches and tenses the vocal ligaments, altering the tone of voice.
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The lateral cricoarytenoid muscles are the major adductors of the vocal folds
The vocal folds, also known as the vocal cords, are multilayered structures that vibrate to produce the voice. They are composed of a muscle covered by a mucosal covering. The mucosal covering of the vocal folds is made of several layers of collagen fibres, arranged differently to give different kinds of strength and flexibility for vibration.
The intrinsic laryngeal muscles act on the individual components of the larynx, controlling the shape of the rima glottidis (the opening between the vocal folds and the arytenoid cartilages) and the length and tension of the vocal folds. The cricothyroid muscle, for example, stretches and tenses the vocal ligaments, altering the tone of voice.
The cricoarytenoid joints are paired synovial joints that act as the fulcrum around which vocal fold movement pivots. The arytenoid cartilages sit atop the back of the cricoid cartilage and hold the back end of the vocal folds. They can rock, glide, and pivot, controlling the movement of the vocal folds. The vocal folds open and close during vibration, allowing for the production of voice.
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The posterior cricoarytenoid muscles are the sole abductors of the vocal folds
The vocal folds, also known as the vocal cords, are multilayered structures that provide a valve for the airway and vibrate to produce the voice. The vocal folds are composed of five layers, with the thyroarytenoid muscle making up the body of the vocal folds. The thyroarytenoid muscle helps close the glottis and regulate tension during speaking and singing.
The intrinsic laryngeal muscles act on the individual components of the larynx, controlling the shape of the rima glottidis (the opening between the vocal folds and the arytenoid cartilages), and the length and tension of the vocal folds. The intrinsic laryngeal muscles also control abduction, adduction, and tensing of the vocal folds.
The lateral cricoarytenoid muscles are the major adductors of the vocal folds. They narrow the rima glottidis, modulating the tone and volume of speech. The transverse and oblique arytenoid muscles adduct the arytenoid cartilages, closing the posterior portion of the rima glottidis. Adduction occurs when the vocal folds come together to close the glottis.
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Frequently asked questions
Vocal folds, also known as vocal cords, are multilayered structures that act as a valve for the airway and vibrate to produce the voice.
The cricothyroid muscle stretches and tenses the vocal ligaments. The lateral cricoarytenoid muscles are also major adductors of the vocal folds.
The primary functions of the vocal folds are voice production, protection of the airway during respiration, and swallowing.
The thyroarytenoid muscle acts to relax the vocal ligament, allowing for a softer voice.
