後輪状披裂筋 - Musculus cricoarytenoideus posterior

説明

Origin: Posterior part of the cricoid

Insertion: Muscular process of the arytenoid cartilage

Nerve: Recurrent laryngeal branch of the vagus

Action: 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

Description:
The Cricoarytaenoideus posterior (posterior cricoarytenoid) arises from the broad depression on the corresponding half of the posterior surface of the lamina of the cricoid cartilage; its fibers run upward and lateralward, and converge to be inserted into the back of the muscular process of the arytenoid cartilage. The uppermost fibers are nearly horizontal, the middle oblique, and the lowest almost vertical.


This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).

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