The Musculus arytaenoideus obliquus is one of the muscles that belong to the laryngeal musculature. He is one of the inner laryngeal muscles. He narrows the glottis, so that a voice formation can take place.

What is the musculus arytaenoideus obliquus?

The larynx is responsible for the formation of the voice. It is located in the upper part of the neck and is set in motion by internal and external muscles. The arytaenoideus obliquus muscle is one of the muscles belonging to the internal laryngeal musculature. The larynx has a vertical shape and is surrounded by cartilage.

In the lower part is the musculus arytaenoideus obliquus. This region is called Caritas laryngis intermedia. There is the glottis. This is also called Rima glottidis. The glottis has the form of a slit-shaped space. It is located between the vocal folds, which are called Plicae vocales. Together with the musculus arytaenoideus transversus, the musculus arytaenoideus obliquus is responsible for the closing process of the glottis. As the muscle contracts, it narrows the pars intercartilaginea. This is a region of the glottis that is located between two processes of the arytenoid cartilages. The two processes approach each other through the muscle, thus enabling phonation or speech formation.

Anatomy & Construction

The larynx is called larynx. It basically consists of cartilage, fibers and muscles. Its task is to separate the trachea from the esophagus. The larynx is subdivided into three areas, which can be visually distinguished as floors. These include the supraglottis at the top, the glottis in the middle and the subglottis at the bottom.

The shape of the larynx is created by the surrounding cartilage framework. This is composed of different elements. These include the Cartilago cricoidea, the Cartilago thyroidea, the Cartilago epiglottica and the Cartilagines arytaenideae. The last of the four elements is the arytenoid cartilage, also called arytenoid cartilage. The musculus arytaenoideus obliquus rises at its height. It begins at the posterior surface of the arytenoid cartilage and pulls to the opposite side. The arytaenoideus obliquus muscle is supplied by two nerves. These are the inferior laryngeal nerve and the recurrent laryngeal nerve. Both are branches of the X. cranial nerve, the vagus nerve. This is responsible, among other things, for the care of the head and neck region.

Function & Tasks

The larynx is completely surrounded by a layered cartilaginous framework. There are a total of four different cartilages in these layers. Each of them has different functions in the activity of the larynx. The arytenoid cartilages play a key role in voice training. The process of phontation is very complex and must be learned. This requires several muscles.

One of these is the musculus arytenoideus obliquus. In order to create a sound, parts of the arytenoid cartilage must be contracted. This process takes place through the musculus arytenoideus obliquus. The course of the fibers of the muscle is diagonal along the arytenoid cartilage. When the muscle contracts, the cartilages it surrounds move closer together. Thus, the vocal folds are automatically approximated to each other. The approximation of the vocal folds are the prerequisite to enable the phonation. This applies to the voice as well as the voice.

If there is a functional failure of the musculus arytenoideus obliquus, the voice automatically becomes slightly hoarse. Phonotation produces deliberate and controlled sounds. For Phonotation to work, several coordinated processes are required. These include hearing, a continuous stream of air, an intact oral, nasal and pharyngeal cavity, as well as the glottis and vocal cords. In the area of ​​the oral, nasal and pharyngeal cavity is the so-called neck tube. Only when all components interact with each other, it comes to phonation.


Diseases of all types in which hoarseness is a concomitant symptom have an effect on voice formation. Hoarseness is called a dysponie. It is a voice disorder. The vocal cords can no longer vibrate freely.

It comes to an impure or occupied voice. This is accompanied by a changed sound. This is usually described as rough. Respiratory infections caused by conditions such as bronchitis or allergic reactions can cause hoarseness. The most common diseases of the larynx are laryngitis, laryngeal carcinoma and tracheal inflammation. Laryngeal inflammation can be chronic or acute. Both trigger hoarseness and irritating cough. A carcinoma can develop in all areas of the larynx. Regardless of the point of origin, laryngeal carcinoma affects the vocal cords and phonation. The same happens in the development of benign neoplasms in the area of ​​the larynx. These can be cysts as well as edema.

An inflammation of the trachea causes cough, hoarseness and a narrowing of the respiratory tract. This has effects on the activity of the larynx and the phonation. Smoking, toxic substances, gases, traumatic states as well as paralysis of the vocal cords have effects on the functioning of the larynx, as well as the glottis. Intubation or surgery on the trachea or larynx may trigger trauma. Intubations are performed in intensive as well as rescue medicine. Depending on the condition and condition of the patient, trauma sometimes occurs during long or dramatic intubations.

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