Thyroarytenoid muscle
You don't need to be Editor-In-Chief to add or edit content to WikiDoc. You can begin to add to or edit text on this WikiDoc page by clicking on the edit button at the top of this page. Next enter or edit the information that you would like to appear here. Once you are done editing, scroll down and click the Save page button at the bottom of the page.
| Thyroarytenoid muscle | |
|---|---|
| Muscles of the larynx, seen from above. | |
| Latin | musculus thyroarytenoideus |
| Gray's | subject #236 1083 |
| Origin | Inner surface of the thyroid cartilage (anterior aspect) |
| Insertion | Anterior surface of arytenoid cartilage |
| Artery: | |
| Nerve: | recurrent laryngeal branch of the vagus |
| Action: | helps to adduct the vocal folds during speech |
| Dorlands /Elsevier | m_22/12551138 |
The Thyroarytenoid is a broad, thin, muscle which lies parallel with and lateral to the vocal fold, and supports the wall of the ventricle and its appendix.
Origin and insertion
It arises in front from the lower half of the angle of the thyroid cartilage, and from the middle cricothyroid ligament.
Its fibers pass backward and lateralward, to be inserted into the base and anterior surface of the arytenoid cartilage.
Parts of thyroarytenoid
The lower and deeper fibers of the muscle can be differentiated as a triangular band which is inserted into the vocal process of the arytenoid cartilage, and into the adjacent portion of its anterior surface; it is termed the Vocalis, and lies parallel with the vocal ligament, to which it is adherent.[1]
A considerable number of the fibers of the Thyreoarytænoideus are prolonged into the aryepiglottic fold, where some of them become lost, while others are continued to the margin of the epiglottis. They have received a distinctive name, Thyreoepiglotticus or Thyroepiglottic, and are sometimes described as a separate muscle. [1]
A few fibers extend along the wall of the ventricle from the lateral wall of the arytenoid cartilage to the side of the epiglottis and constitute the Ventricularis muscle.
Actions
The Thyreoarytœnoidei, consisting of two parts having different attachments and different directions, are rather complicated as regards their action.
Their main use is to draw the arytenoid cartilages forward toward the thyroid, and thus relax and shorten the vocal folds.
But, owing to the connection of the deeper portion with the vocal fold, this part, if acting separately, is supposed to modify its elasticity and tension, while the lateral portion rotates the arytenoid cartilage inward, and thus narrows the rima glottidis by bringing the two vocal folds together.
Additional images
 The cartilages of the larynx. Posterior view. |
 Coronal section of larynx and upper part of trachea. |
 Muscles of larynx. Side view. Right lamina of thyroid cartilage removed. |
Vocalis muscle.JPG
Cross sectional cut of vocalis muscle |
References
External links
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
 | This muscle article is a stub. You can help WikiDoc by expanding it. |
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
