Arytenoid muscle explained

Arytenoid muscle
Latin:musculus arytaenoideus
Origin:Arytenoid cartilage on one side
Insertion:Arytenoid cartilage on opposite side
Blood:Superior laryngeal artery
Nerve:Recurrent laryngeal branch of the vagus
Action:Approximate the arytenoid cartilages (close rima glottis)

The arytenoid muscle or interarytenoid muscle is a composite intrinsic muscle of the larynx, consisting of a transverse part and an oblique part - the two parts may be considered as separate muscles: an unpaired transverse arytenoid muscle, and a bilaterally paired oblique arytenoid muscle.[1]

The two constituent parts differ in their attachments, structure and actions. Both receive motor innervation from the recurrent laryngeal nerve(s) (each nerve being a branch of one vagus nerve (CN X)).

Clinical significance

Electromyography

Function of the arytenoid muscle is a good method to determine function of the recurrent laryngeal nerve.[2] Continuous electromyography of the arytenoid muscle can provide confidence to surgeons that the recurrent laryngeal nerve is not damaged during neck surgeries, such as thyroidectomy.

Other animals

The arytenoid muscle is found in many animals, including dogs.[3]

References

  1. Book: Standring, Susan . Gray's Anatomy: The Anatomical Basis of Clinical Practice . 2020 . 978-0-7020-7707-4 . 42th . New York . 727 . 1201341621.
  2. Li . Peng . Liang . Qing-Zhuang . Wang . Dong-Lai . Han . Bin . Yi . Xin . Wei . Wei . October 2019 . Modified arytenoid muscle electrode recording method for neuromonitoring during thyroidectomy . . 8 . 5 . 469–476 . 10.21037/gs.2019.08.07 . 2227-684X . 6842767 . 31741877 . free .
  3. 隆一 . 相原 . 1991 . イヌ披裂筋の構造と運動神経支配に関する研究 . 日本耳鼻咽喉科学会会報 . 94 . 6 . 805–816 . 10.3950/jibiinkoka.94.805 . 1715914 . free.