Oblique arytenoid

Oblique arytenoid
Musculusarytenoideus.png
Muscles of larynx. Posterior view.
Oblique arytenoid: The "X" in the center.
Transverse arytenoid: Bands underneath the "X".
Aryepiglotticus: Wraps around back.
Gray953.png
Sagittal section of the larynx and upper part of the trachea. (Arytenoideus visible at center right.)
Latin musculus arytenoideus obliquus
Gray's subject #236 1082
Origin Posterior surface of muscular process of arytenoid cartilage
Insertion    Posterior surface of apex of adjacent arytenoid cartilage; extends into aryepiglottic fold
Artery
Nerve recurrent laryngeal branch of vagus nerve [X]
Actions Sphincter of the laryngeal inlet

The oblique arytenoid, the more superficial Arytenoid muscle, forms two fasciculi, which pass from the base of one cartilage to the apex of the opposite one, and therefore cross each other like the limbs of the letter X; a few fibers are continued around the lateral margin of the cartilage, and are prolonged into the aryepiglottic fold; they are sometimes described as a separate muscle, the Aryepiglotticus.

The aryepiglottic muscle together with the transverse arytenoid and the thyroarytenoid work as a sphincter and close the larynx as we swallow or cough. Its innervation is by the recurrent laryngeal nerve (from vagus) just like all the intrinsic muscles of the larynx except the cricothyroid muscle.

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 As such, some of the information contained within it may be outdated.


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