What is the difference between intrinsic and extrinsic laryngeal muscles?
What is the difference between intrinsic and extrinsic laryngeal muscles?
The muscles of the larynx are divided into two groups: Extrinsic muscles, which produce the movements of the hyoid bone. Intrinsic muscles, which move the vocal cords in order to produce speech sounds.
What is the function of the extrinsic and intrinsic laryngeal muscles?
There are two types of laryngeal muscles, the external (extrinsic) ones, which move the larynx as a whole, and the internal (intrinsic) ones, which move the vocal folds to shape the glottis.
What does the external laryngeal nerve innervate?
The external laryngeal nerve runs lateral to the larynx deep to the sternothyroid muscle and innervates the cricothyroid and superior pharyngeal muscles.
What are the extrinsic muscles of larynx?
Extrinsic
- Sternothyroid muscles depress the larynx. (
- Omohyoid muscles depress the larynx. (
- Sternohyoid muscles depress the larynx. (
- Inferior constrictor muscles. (
- Thyrohyoid muscles elevates the larynx. (
- Digastric elevates the larynx. (
- Stylohyoid elevates the larynx. (
- Mylohyoid elevates the larynx. (
What gives rise to intrinsic and extrinsic laryngeal muscles?
The nucleus ambiguous within the brain stem provides the motoneurons to the intrinsic laryngeal muscles while the hypoglossal nucleus provides the motoneurons to extrinsic muscles.
Which muscle is innervated by the superior laryngeal nerve?
The superior laryngeal nerve, a branch of the vagus nerve, innervates the cricothyroid muscle of the larynx. This muscle stretches, tenses, and adducts the vocal cord. Superior laryngeal neuralgia usually appears as a postsurgical complication.
What are intrinsic laryngeal muscles?
The intrinsic laryngeal muscles act on the individual components of the larynx. They control the shape of the rima glottidis (opening between the vocal folds and the arytenoid cartilages), and the length and tension of the vocal folds.
How many intrinsic muscles does the larynx have?
The larynx is comprised of 10 muscles. With the various muscles changing the position, length and tension of the vocal cords quite a range of sounds can be generated. There are five muscles on each side of the larynx.
