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The larynx, or 'voice box', is a triangle-shaped structure in the neck that plays a critical role in respiration, phonation, and airway protection during swallowing. It is composed of various muscles, including intrinsic and extrinsic muscles, which work together to facilitate these essential functions. The intrinsic muscles, such as the cricothyroid and thyroarytenoid, are small muscles located entirely within the larynx and are responsible for fine-tuning the length, tension, and position of the vocal cords, thus enabling sound production. On the other hand, the extrinsic muscles, like the suprahyoid and infrahyoid muscles, are attached to the hyoid bone and facilitate the movement of the larynx as a whole during swallowing and speech. While the larynx is indeed supported by a complex network of muscles, it is not accurate to describe the larynx itself as a flat muscle.
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What You'll Learn
- The larynx is a cartilaginous skeleton with muscles or fibrous tissue
- The intrinsic muscles of the larynx alter vocal cord length and tension
- The extrinsic muscles move the larynx and hyoid bone
- The cricothyroid muscle is the 'singer's muscle'
- The larynx is critical for respiration, airway protection and phonation
The larynx is a cartilaginous skeleton with muscles or fibrous tissue
The larynx is a complex structure located in the anterior midline region of the neck. It is composed of a skeleton made of cartilage, with associated muscles and ligaments that suspend it from surrounding structures. The larynx is also lined by a mucous membrane.
The laryngeal skeleton consists of nine cartilages: the thyroid cartilage, cricoid cartilage, epiglottis, arytenoid cartilage, corniculate cartilage, and cuneiform cartilage. The first three are unpaired, and the latter three are paired. The thyroid cartilage is the largest of the laryngeal cartilages and is composed of hyaline cartilage. It forms the anterior and lateral portions of the larynx and serves as a protective shield for the vocal cords. The cricoid cartilage is a smaller, signet ring-shaped hyaline cartilage located directly below the thyroid cartilage. It forms the inferior aspect of the larynx and is the only complete ring of cartilage that encircles the airway. The epiglottis is a large, spoon-shaped piece of elastic cartilage that covers the opening of the larynx. During swallowing, the larynx rises, causing the epiglottis to move down and form a lid over the glottis, closing it off.
The arytenoid cartilages are a pair of small, pyramid-shaped cartilages located over the posterior portion of the cricoid cartilage. They are the most important paired cartilages as they influence the position and tension of the vocal cords. The corniculate cartilages are horn-shaped pieces of elastic cartilage located at the apex of each arytenoid cartilage. The cuneiform cartilages are club-shaped pieces of elastic cartilage located anterior to the corniculate cartilages. They do not directly attach to any other laryngeal cartilage but are suspended within and strengthen a fibro-elastic membrane called the aryepiglottic membrane.
The muscles of the larynx are divided into two groups: extrinsic and intrinsic. The extrinsic muscles are attached to the hyoid bone and move the thyroid cartilage. They include the infrahyoid and suprahyoid muscles. The infrahyoid muscles include the sternohyoid, omohyoid, sternothyroid, and thyrohyoid muscles, which work to lower the larynx and hyoid bone. The suprahyoid muscles, including the stylohyoid, digastric, and mylohyoid muscles, fixate and elevate the hyoid bone and the larynx. The stylopharyngeus muscle is also an extrinsic muscle, but it is not attached directly to the hyoid bone. Instead, it acts indirectly to elevate the hyoid bone and the larynx.
The intrinsic muscles, on the other hand, are confined entirely within the larynx and are responsible for controlling sound production. They are divided into respiratory and phonatory muscles. The respiratory muscles move the vocal cords apart and serve breathing, while the phonatory muscles move the vocal cords together and serve the production of voice. The main respiratory muscles are the posterior cricoarytenoid muscles, which are the sole abductors of the vocal folds. The phonatory muscles are divided into adductors (lateral cricoarytenoid and arytenoid muscles) and tensors (cricothyroid and thyroarytenoid muscles). The cricothyroid muscle is important for the creation of forceful speech and altering the tone of voice, earning it the nickname "singer's muscle".
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The intrinsic muscles of the larynx alter vocal cord length and tension
The larynx, or voice box, is an organ in the anterior neck. It is a component of the respiratory tract and has several important functions, including phonation, the cough reflex, and protection of the lower respiratory tract. The muscles of the larynx are divided into two groups: extrinsic and intrinsic. The extrinsic muscles act to move the larynx superiorly and inferiorly, while the intrinsic muscles move the vocal cords to produce speech sounds.
The cricothyroid muscles are responsible for tensing the vocal cords and altering the tone of voice, earning them the nickname "singer's muscle". They originate from the anterolateral aspect of the cricoid cartilage and attach to the inferior margin and inferior horn of the thyroid cartilage. The thyroarytenoid and vocalis muscles, on the other hand, are responsible for relaxing the vocal cords. The thyroarytenoid muscle originates from the angle of the thyroid cartilage and adjacent cricothyroid ligament, inserting into the anterolateral surface of the arytenoid cartilage. The vocalis muscle extends on each side from the arytenoid cartilage to the inside of the thyroid cartilage, forming the body of the vocal fold.
The intrinsic muscles of the larynx are innervated by the recurrent laryngeal nerve, a branch of the vagus nerve. The cricothyroid muscle, however, is innervated by the external branch of the superior laryngeal nerve, also derived from the vagus nerve. Injury to the recurrent laryngeal nerve can result in hoarseness, unilateral injury may cause minor shortness of breath, and bilateral injury can lead to breathing problems and snoring.
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The extrinsic muscles move the larynx and hyoid bone
The larynx is a triangle-shaped structure in the neck that is involved in breathing, swallowing, and phonation. It is composed of various muscles, ligaments, membranes, and cartilages. The muscles of the larynx are divided into two groups: extrinsic and intrinsic muscles.
The extrinsic muscles of the larynx are those that are attached to the hyoid bone either via origin or insertion. They act on the larynx as a whole to produce its movements, including elevating or depressing the larynx during swallowing. The hyoid bone is bound to the larynx by strong ligaments, allowing the entire larynx to be moved as one unit. The extrinsic muscles are further divided into two groups: the infrahyoid and suprahyoid muscles.
The infrahyoid muscles are a group of muscles that attach to the lower larynx and the inferior aspect of the hyoid bone. They include the sternohyoid, omohyoid, sternothyroid, and thyrohyoid muscles. These muscles work together to depress or lower the larynx and the hyoid bone.
The suprahyoid muscles, on the other hand, are attached to the superior aspect of the hyoid bone. They include the stylohyoid, digastric, mylohyoid, and geniohyoid muscles. The stylopharyngeus muscle is also considered part of the suprahyoid group, although it is not directly attached to the hyoid bone. The suprahyoid muscles function to fixate the hyoid bone and elevate it along with the larynx.
In summary, the extrinsic muscles of the larynx are responsible for moving the larynx and hyoid bone as a unit. They consist of the infrahyoid and suprahyoid muscle groups, which work together to depress or elevate the laryngeal structure, respectively.
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The cricothyroid muscle is the 'singer's muscle'
The larynx is a triangle-shaped structure that is largely made up of cartilages and muscles. The muscles of the larynx are divided into two groups: extrinsic and intrinsic muscles. The extrinsic muscles are attached to the hyoid bone and move the thyroid cartilage, while the intrinsic muscles are confined within the larynx and control sound production.
The cricothyroid muscle is an intrinsic muscle of the larynx that originates from the anterolateral aspect of the cricoid cartilage and attaches to the inferior margin and inferior horn of the thyroid cartilage. It is innervated by the external branch of the superior laryngeal nerve, which is a branch of the vagus nerve.
The cricothyroid muscle is responsible for stretching, lengthening, and tensing the vocal cords and ligaments, which results in higher pitch phonation. This muscle is important for creating forceful speech and altering the tone of voice. Singers use this muscle to control their vocal register, with headmix and head registers using cricothyroid muscle-dominant voicing, and chest and chestmix registers using thyroarytenoid muscle-dominant voicing. This is because the cricothyroid muscle is capable of producing a higher range of pitches, while the thyroarytenoid muscle produces a lower range.
The cricothyroid muscle is often referred to as the "singer's muscle" because of its role in vocalization and its importance in singing. By manipulating the cricothyroid muscle, singers are able to control the tension and length of their vocal cords, allowing them to produce a wide range of pitches and tones. This muscle is essential for singers to achieve the desired sound and quality in their performances.
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The larynx is critical for respiration, airway protection and phonation
The larynx is a vital part of the human body, serving multiple functions, including respiration, airway protection, and phonation. It is a triangle-shaped structure located in the anterior aspect of the neck, consisting largely of cartilages attached to one another and the surrounding structures by muscles, ligaments, or fibrous and elastic tissue components. The larynx houses the vocal cords, which vibrate to produce sound during speech.
The larynx is essential for respiration as it controls airflow, pressure, and resistance in the airway. It achieves this by altering the diameter of the airway through intricate movements of the vocal cords and arytenoid cartilages. During inspiration, the glottis dilates to facilitate air intake, while the vocal cords abduct to widen the airway and maximize airflow. The larynx also plays a crucial role in airway protection by acting as a mechanical barrier to prevent the entry of foreign objects and aspiration into the lungs.
The intrinsic muscles of the larynx, such as the cricothyroid and thyroarytenoid muscles, are responsible for phonation by controlling sound production. They adjust the length and tension of the vocal cords, allowing for the modulation of tone and volume during speech. The extrinsic muscles, on the other hand, are attached to the hyoid bone and move the thyroid cartilage, influencing the position and movement of the larynx.
The larynx also contributes to other functions, including coughing, the Valsalva maneuver, and controlling ventilation. The intricate interplay between airflow and vocal fold tension during phonation is critical for sound modulation. Additionally, the anatomical variations in the laryngeal cartilages can influence phonation characteristics, highlighting the importance of understanding these differences for clinical applications such as voice therapy and surgical interventions.
In summary, the larynx is indeed critical for respiration, airway protection, and phonation. Its complex anatomy and the coordination of various muscles ensure the proper functioning of these vital processes.
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Frequently asked questions
The larynx is an organ located in the anterior midline region of the neck. It is also known as the voice box.
The larynx is involved in breathing, producing sound, and protecting the trachea against food aspiration.
There are two groups of muscles associated with the larynx: the extrinsic and intrinsic muscles. The former moves the larynx as a whole, while the latter moves its individual components.
The extrinsic muscles elevate or depress the larynx during swallowing. The intrinsic muscles, on the other hand, alter the length and tension of the vocal cords, as well as the shape of the rima glottidis during breathing, swallowing, and vocalization.
The vocal apparatus of the larynx is called the glottis. It consists of two vocal folds (true vocal cords) and the rima glottidis.
