Larynx muscles

from Wikipedia, the free encyclopedia

The larynx ( Latin: larynx ) is surrounded and moved by various skeletal muscles , which are known as the larynx muscles ( laryngeal muscles ). They have different effects on the glottis and the vocal cords .

The muscles are mostly named after the two cartilages between which they run:

Larynx muscles of man

Latin name origin approach Innervation function
External larynx muscles
Cricothyroid muscle Arcus of the cricoid cartilage Lower margin and lower horn of the thyroid cartilage R. externus of the N. laryngeus superior Moves the cricoid cartilage up / back, which tightens the vocal cords
Internal larynx muscles
Musculus cricoarytaenoideus posterior (short: Posticus ) posterior outer surface of the lamina of the cricoid cartilage Processus muscularis of the control cartilage Inferior laryngeal nerve pulls Proc. muscularis backwards, opens (as the only muscle) glottis
Cricoarytaenoideus lateralis muscle upper edge and outer surface of the arcus of the cricoid cartilage Proc. muscularis of the control cartilage pulls Proc. muscularis inwards, thereby closing the glottis
Thyreoarytaenoideus muscle Inner surface of the thyroid cartilage Anterior and lateral surface of the control cartilage Closing the glottis
Arytaenoideus transversus muscle (unpaired) backwards, between the anterior cartilage
Arytaenoideus obliquus muscle (paired) Proc. muscularis of the control cartilage Apex of the other anterior cartilage
Thyreoepiglotticus muscle Anterior surface of the lamina of the thyroid cartilage Proc. vocalis Adducts the vocal cords
Aryepiglotticus muscle Apex of the cartilage Lateral surfaces of the larynx Adducts the vocal cords
Vocalis muscle Angle between the two laminae of the thyroid cartilage Proc. vocalis causes internal tension in the vocal cords and closes the glottis

Special features of the other mammals

In the non-primates, the larynx muscles behave in exactly the same way, with a few differences. Please note the following:

  • The muscle cricoarytaenoideus posterior is muscle cricoarytaenoideus dorsalis called. It is also the only glottis dilator in animals, while all other muscles constrict the glottis.
  • The thyreoarytaenoideus muscle in horses and dogs is divided into two muscle legs , namely the anterior ventricularis muscle and the posterior vocalis muscle . Between these two muscle strands, the lateral laryngeal pocket ( ventriculus laryngis ) protrudes to the side from the interior of the larynx .
  • Horses also have a thyreoarytaenoideus accessory and a tensor ventriculi laryngis muscle .
  • The hyoepiglotticus muscle (between the hyoid bone and the epiglottis) is also included in the larynx muscles .
  • Arytaenoideus obliquus , aryepiglotticus, and thyreoepiglotticus muscles are absent from most non-primates.


  • Franz-Viktor Salomon: respiratory system. In: In: Franz-Viktor Salomon, Hans Geyer, Uwe Gille (ed.): Anatomy for veterinary medicine. 2nd, revised and expanded edition. Enke, Stuttgart 2008, ISBN 978-3-8304-1075-1 , pp. 324-367.