Thyroarytenoid muscle
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2008-01-16T15:37:19Z
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{{Infobox Muscle |
Name = {{PAGENAME}} |
Latin = musculus thyroarytenoideus |
GraySubject = 236 |
GrayPage = 1083 |
Image = Musculusthyreoarytenoideus.png |
Caption = Muscles of the [[larynx]], seen from above. |
Origin = Inner surface of the [[thyroid cartilage]] (anterior aspect) |
Insertion = Anterior surface of [[arytenoid cartilage]] |
Blood = |
Nerve = [[recurrent laryngeal nerve|recurrent laryngeal]] branch of the [[vagus]] |
Action = helps to [[Adduction|adduct]] the [[vocal folds]] during [[Manner of articulation|speech]] |
DorlandsPre = m_22 |
DorlandsSuf = 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.<ref>{{eMedicineDictionary|Vocalis+muscle}}</ref>
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. <ref>{{eMedicineDictionary|Thyroepiglottic+muscle}}</ref>
A few fibers extend along the wall of the ventricle from the lateral wall of the [[arytenoid cartilag]]e 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==
<gallery>
Image:Gray950.png|The cartilages of the larynx. Posterior view.
Image:Gray954.png|Coronal section of larynx and upper part of trachea.
Image:Gray959.png|Muscles of larynx. Side view. Right lamina of thyroid cartilage removed.
Image:Vocalis muscle.JPG|Cross sectional cut of vocalis muscle
</gallery>
==References==
<references/>
==External links==
* {{SUNYAnatomyLabs|32|st|06|05}}
* {{eMedicineDictionary|Thyroarytenoid+muscle}}
* {{UMichAtlas|rsa4p5}}
{{Gray's}}
{{Muscles of head}}
[[Category:Muscles of the head and neck]]
{{muscle-stub}}
[[hu:Musculus thyreoarytenoideus]]
[[sr:Тироаритеноидни мишић]]
[[sh:Tiroaritenoidni mišić]]