Arytenoid muscle

The arytenoid muscle /ærɪˈtiːnɔɪd/ 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]

Arytenoid muscle
Muscles of larynx. Posterior view.
Oblique arytenoid: The "X" in the center.
Transverse arytenoid: Bands underneath the "X".
Aryepiglotticus: Wraps around back.
Sagittal section of the larynx and upper part of the trachea. (Arytenoideus visible at center right.)
Details
OriginArytenoid cartilage on one side
InsertionArytenoid cartilage on opposite side
Arterysuperior laryngeal artery
Nerverecurrent laryngeal branch of the vagus
Actionsapproximate the arytenoid cartilages (close rima glottis)
Identifiers
LatinMusculus arytaenoideus
TA98A06.2.08.012
A06.2.08.010
TA22203, 2205
FMA46582
Anatomical terms of muscle

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)).[1]

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.[2]

Other animals

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

Additional images
  • The cartilages of the larynx. Posterior view.
    The cartilages of the larynx. Posterior view.
  • Muscles of larynx. Side view. Right lamina of thyroid cartilage removed.
    Muscles of larynx. Side view. Right lamina of thyroid cartilage removed.
  • Aryepiglotic muscle
    Aryepiglotic muscle
  • Muscles of the larynx, seen from above.
    Muscles of the larynx, seen from above.
  • Dissection of the muscles of the palate from behind.
    Dissection of the muscles of the palate from behind.

References
  1. Standring, Susan (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice (42th ed.). New York. p. 727. ISBN 978-0-7020-7707-4. OCLC 1201341621.{{cite book}}: CS1 maint: location missing publisher (link)
  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". Gland Surgery. 8 (5): 469–476. doi:10.21037/gs.2019.08.07. ISSN 2227-684X. PMC 6842767. PMID 31741877.
  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. doi:10.3950/jibiinkoka.94.805. PMID 1715914.
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