Arytenoid muscle

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 arytenoid muscle /ærɪˈtiːnɔɪd/ is a single muscle of the larynx. It passes from one arytenoid cartilage to the opposite arytenoid cartilage. It has oblique and transverse fibres. It is supplied by the recurrent laryngeal nerve. It approximates the arytenoid cartilages. Continuous electromyography may be used during neck surgeries such as thyroidectomy.

Structure

The arytenoid muscle fills the posterior concave surface of the arytenoid cartilage. It arises from the posterior surface and lateral border of one arytenoid cartilage. It is inserted into the corresponding parts of the opposite arytenoid cartilage.

It consists of oblique and transverse fibres.

Nerve supply

The arytenoid muscle is supplied by the recurrent laryngeal nerve, a branch of the vagus nerve (CN X).[1] This is a bilateral supply.[2]

Function

The arytenoid muscle approximates the arytenoid cartilages. This closes the aperture of the glottis, especially at its back part to eliminate the posterior commissure of the vocal cords.

Clinical significance

Electromyography

Function of the arytenoid muscle is a good method to determine function of the recurrent laryngeal nerve.[1] 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.[1]

Other animals

The arytenoid muscle is found in many animals, including dogs.[2]

Additional images

References

  1. 1 2 3 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.
  2. 1 2 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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