Posterior cricoarytenoid muscle

Posterior cricoarytenoid muscle
Posterior cricoarytenoid
Musculuscricoarytenoideusposterior.png
Muscles of larynx. Side view. Right lamina of thyroid cartilage removed.
Latin musculus cricoarytenoideus posterior
Gray's subject #236 1082
Origin posterior part of the cricoid
Insertion    muscular process of the arytenoid cartilage
Artery {{{Blood}}}
Nerve 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

The posterior cricoarytenoid muscles are extremely small, paired muscles that extend from the posterior cricoid cartilage to the arytenoid cartilages in the larynx. By rotating the arytenoid cartilages laterally, these muscles abduct the vocal cords and thereby open the rima glottidis. Their action opposes the lateral cricoarytenoid muscles. The posterior cricoarytenoid muscles receive innervation from the recurrent laryngeal branch of the vagus nerve (CN X).

Paralysis of the posterior cricoarytenoid muscles may lead to asphyxiation as they are the only laryngeal muscles to open the true vocal folds, allowing inspiration and expiration.[1]

Additional images

References

  1. ^ The Arytenoid Cartilages - a clinical overview. 2002, Dr. C Kay et al. Thorne Publishing (C)

External links


Wikimedia Foundation. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • Cricoarytenoid muscle — Muscles of larynx. Side view. Right lamina of thyroid cartilage removed. Gray s subject #236 1082 …   Wikipedia

  • Lateral cricoarytenoid muscle — Lateral cricoarytenoid Muscles of larynx. Side view. Right lamina of thyroid cartilage removed. Latin musculus cricoarytenoideus lateralis …   Wikipedia

  • cricoarytenoid muscle posterior — musculus cricoarytenoideus posterior …   Medical dictionary

  • Muscle — is the tissue of the body which primarily functions as a source of power. There are three types of muscle in the body. Muscle which is responsible for moving extremities and external areas of the body is called "skeletal muscle." Heart… …   Medical dictionary

  • Cricoarytenoid articulation — Muscles of the larynx, seen from above. Muscles of larynx. Side view. Rig …   Wikipedia

  • cricoarytenoid — Relating to the cricoid and arytenoid cartilages. * * * cri·co·ar·y·te·noid .krī kō .ar ə tē .nȯid, kō ə rit ən .ȯid n 1) a muscle of the larynx that arises from the upper margin of the arch of the cricoid cartilage, inserts into the front of… …   Medical dictionary

  • musculus cricoarytenoideus posterior — [TA] posterior cricoarytenoid muscle: one of the intrinsic muscles of the larynx; origin, back of cricoid cartilage; insertion, muscular process of arytenoid cartilage; innervation, recurrent laryngeal; action, separates vocal folds …   Medical dictionary

  • Muscle — For other uses of Muscle , see Muscle (disambiguation). A top down view of skeletal muscle Muscle (from Latin …   Wikipedia

  • Cricothyroid muscle — Muscles of larynx. Side view. Right lamina of thyroid cartilage removed …   Wikipedia

  • Digastric muscle — Muscles of the neck. Lateral view …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”