Posterior cricoarytenoid muscle
| Posterior cricoarytenoid | |
|---|---|
Muscles of larynx. Side view. Right lamina of thyroid cartilage removed.
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| Details | |
| Latin | Musculus cricoarytaenoideus posterior |
| Origin | posterior part of the cricoid |
| Insertion | muscular process of the arytenoid cartilage |
| recurrent laryngeal branch of the vagus | |
| Actions | abducts and laterally rotates the cartilage, pulling the vocal ligaments away from the midline and forward and so opening the rima glottidis |
| Antagonist | Lateral cricoarytenoid muscle |
| Identifiers | |
| Dorlands /Elsevier |
m_22/12548696 |
| TA | Lua error in Module:Wikidata at line 744: attempt to index field 'wikibase' (a nil value). |
| TH | {{#property:P1694}} |
| TE | {{#property:P1693}} |
| FMA | {{#property:P1402}} |
| Anatomical terms of muscle
[[[d:Lua error in Module:Wikidata at line 863: attempt to index field 'wikibase' (a nil value).|edit on Wikidata]]]
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The posterior cricoarytenoid muscles are small, paired muscles that extend from the posterior cricoid cartilage to the arytenoid cartilages in the larynx.
Contents
Structure
Innervation
The posterior cricoarytenoid muscles receive innervation from the recurrent laryngeal branch of the vagus nerve.[1] :10
Function
The cricoarytenoid muscles are the only muscles to open the vocal cords. By rotating the arytenoid cartilages laterally, these muscles abduct the vocal cords and thereby open the rima glottidis.[1] :9 Their action opposes the lateral cricoarytenoid muscles.
Clinical significance
Paralysis of the posterior cricoarytenoid muscles may lead to asphyxiation as they are the only laryngeal muscles to open the true vocal cords, allowing inspiration and expiration.[2]
Additional images
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The cartilages of the larynx. Posterior view.
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Muscles of larynx. Posterior view.
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Muscles of the larynx, seen from above.
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Dissection of the muscles of the palate from behind.
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Posterior cricoarytenoid muscle
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Posterior cricoarytenoid muscle
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Posterior cricoarytenoid muscle
See also
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References
External links
- Atlas image: rsa4p2 at the University of Michigan Health System
- lesson11 at The Anatomy Lesson by Wesley Norman (Georgetown University) (larynxmuscles)
