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Wikipedia

Cricothyroid muscle

August 22, 2023

Not to be confused with Posterior cricoarytenoid muscle.

The cricothyroid muscle is the only tensor muscle of the larynx aiding with phonation. It is innervated by the superior laryngeal nerve. Its action tilts the thyroid forward to help tense the vocal cords.

Cricothyroid muscle
Muscles of larynx. Side view. Right lamina of thyroid cartilage removed.
The ligaments of the larynx. Antero-lateral view.
Details
OriginAnterior and lateral cricoid cartilage
InsertionInferior cornu and lamina of the thyroid cartilage
NerveExternal branch of Superior laryngeal nerve (branch of the vagus nerve)
Actionstension and elongation of the vocal folds
Identifiers
LatinMusculus cricothyroideus
TA98A06.2.08.001
TA22193
FMA46417
Anatomical terms of muscle
[edit on Wikidata]

Structure

The cricothyroid muscle is a fan-shaped muscle situated at the outer surface of the larynx.[1]

Origin

The cricothyroid muscle originates from the anterolateral aspect of the cricoid cartilage.[2]

Insertion

The cricothyroid muscle splits into two groups or parts. The oblique part travels posterolaterally and inserts onto the inferior cornu of the thyroid cartilage. The straight part travels posterosuperiorly and inserts onto the inferior margin of the lamina of the thyroid cartilage.[1]

Innervation

The cricothyroid muscle is innervated by the external branch of the superior laryngeal nerve (a branch of the vagus nerve). It is the only laryngeal muscle innervated by this nerve.[3][4]

Function

The cricothyroid muscle produces tension and elongation of the vocal cords.[3][5] They draw up the arch of the cricoid cartilage and tilt back the upper border of the cricoid cartilage lamina.[3][5] The distance between the vocal processes and the angle of the thyroid is increased, elongating[3] and thus tensing the vocal folds,[1] thereby resulting in higher pitch phonation.[3] They work as antagonists to the posterior cricoarytenoid muscles.[6]

Clinical significance

The cricothyroid muscles may be injected with botulinum toxin whilst treating spasmodic dysphonia.[6] This is usually performed under guidance from electromyography.[6]

Additional images

  •  

    The veins of the thyroid gland.

  •  

    The fascia and middle thyroid veins.

  •  

    Side view of the larynx, showing muscular attachments.

See also

References

  1. ^ a b c Sinnatamby, Chummy (2011). Last's Anatomy (12th ed.). p. 395. ISBN 978-0-7295-3752-0.
  2. ^ "Cricothyroid". www.meddean.luc.edu. Retrieved 2022-06-06.
  3. ^ a b c d e Duarte, Robert A.; Argoff, Charles E. (2009-01-01), Argoff, Charles E.; McCleane, Gary (eds.), "Chapter 19 - Glossopharyngeal and other Facial Neuralgias", Pain Management Secrets (Third Edition), Philadelphia: Mosby, pp. 116–118, ISBN 978-0-323-04019-8, retrieved 2021-01-12
  4. ^ Kaplan, Edwin L.; Angelos, Peter; James, Benjamin C.; Nagar, Sapna; Grogan, Raymon H. (2016-01-01), Jameson, J. Larry; De Groot, Leslie J; de Kretser, David M.; Giudice, Linda C. (eds.), "Chapter 96 - Surgery of the Thyroid", Endocrinology: Adult and Pediatric (Seventh Edition), Philadelphia: W.B. Saunders, pp. 1666–1692.e4, doi:10.1016/b978-0-323-18907-1.00096-2, ISBN 978-0-323-18907-1, retrieved 2021-01-12
  5. ^ a b Berke, Gerald S.; Long, Jennifer L. (2010-01-01), Brudzynski, Stefan M. (ed.), "Chapter 10.1 - Functions of the larynx and production of sounds", Handbook of Behavioral Neuroscience, Handbook of Mammalian Vocalization, Elsevier, vol. 19, pp. 419–426, doi:10.1016/B978-0-12-374593-4.00038-3, retrieved 2021-01-12
  6. ^ a b c Bentivoglio, Anna Rita; Fasano, Alfonso; Albanese, Alberto (2009-01-01), Jankovic, Joseph; Albanese, Alberto; Atassi, M. Zouhair; Dolly, J. Oliver (eds.), "10 - Botulinum Neurotoxin in Tremors, Tics, Hemifacial Spasm, Spasmodic Dysphonia, and Stuttering", Botulinum Toxin, Philadelphia: W.B. Saunders, pp. 112–130, doi:10.1016/b978-1-4160-4928-9.00010-x, ISBN 978-1-4160-4928-9, retrieved 2021-01-12

August 22, 2023
cricothyroid, muscle, confused, with, posterior, cricoarytenoid, muscle, cricothyroid, muscle, only, tensor, muscle, larynx, aiding, with, phonation, innervated, superior, laryngeal, nerve, action, tilts, thyroid, forward, help, tense, vocal, cords, muscles, l. Not to be confused with Posterior cricoarytenoid muscle The cricothyroid muscle is the only tensor muscle of the larynx aiding with phonation It is innervated by the superior laryngeal nerve Its action tilts the thyroid forward to help tense the vocal cords Cricothyroid muscleMuscles of larynx Side view Right lamina of thyroid cartilage removed The ligaments of the larynx Antero lateral view DetailsOriginAnterior and lateral cricoid cartilageInsertionInferior cornu and lamina of the thyroid cartilageNerveExternal branch of Superior laryngeal nerve branch of the vagus nerve Actionstension and elongation of the vocal foldsIdentifiersLatinMusculus cricothyroideusTA98A06 2 08 001TA22193FMA46417Anatomical terms of muscle edit on Wikidata Contents 1 Structure 1 1 Origin 1 2 Insertion 1 3 Innervation 2 Function 3 Clinical significance 4 Additional images 5 See also 6 ReferencesStructure EditThe cricothyroid muscle is a fan shaped muscle situated at the outer surface of the larynx 1 Origin Edit The cricothyroid muscle originates from the anterolateral aspect of the cricoid cartilage 2 Insertion Edit The cricothyroid muscle splits into two groups or parts The oblique part travels posterolaterally and inserts onto the inferior cornu of the thyroid cartilage The straight part travels posterosuperiorly and inserts onto the inferior margin of the lamina of the thyroid cartilage 1 Innervation Edit The cricothyroid muscle is innervated by the external branch of the superior laryngeal nerve a branch of the vagus nerve It is the only laryngeal muscle innervated by this nerve 3 4 Function EditThe cricothyroid muscle produces tension and elongation of the vocal cords 3 5 They draw up the arch of the cricoid cartilage and tilt back the upper border of the cricoid cartilage lamina 3 5 The distance between the vocal processes and the angle of the thyroid is increased elongating 3 and thus tensing the vocal folds 1 thereby resulting in higher pitch phonation 3 They work as antagonists to the posterior cricoarytenoid muscles 6 Clinical significance EditThe cricothyroid muscles may be injected with botulinum toxin whilst treating spasmodic dysphonia 6 This is usually performed under guidance from electromyography 6 Additional images Edit The veins of the thyroid gland The fascia and middle thyroid veins Side view of the larynx showing muscular attachments See also EditCricothyroid ligament Larynx vocal fold Thyroid cartilage Vocology science and practice of voice habilitation Adam s apple Phonation National Center for Voice and Speech Cricothyroid approximationReferences Edit a b c Sinnatamby Chummy 2011 Last s Anatomy 12th ed p 395 ISBN 978 0 7295 3752 0 Cricothyroid www meddean luc edu Retrieved 2022 06 06 a b c d e Duarte Robert A Argoff Charles E 2009 01 01 Argoff Charles E McCleane Gary eds Chapter 19 Glossopharyngeal and other Facial Neuralgias Pain Management Secrets Third Edition Philadelphia Mosby pp 116 118 ISBN 978 0 323 04019 8 retrieved 2021 01 12 Kaplan Edwin L Angelos Peter James Benjamin C Nagar Sapna Grogan Raymon H 2016 01 01 Jameson J Larry De Groot Leslie J de Kretser David M Giudice Linda C eds Chapter 96 Surgery of the Thyroid Endocrinology Adult and Pediatric Seventh Edition Philadelphia W B Saunders pp 1666 1692 e4 doi 10 1016 b978 0 323 18907 1 00096 2 ISBN 978 0 323 18907 1 retrieved 2021 01 12 a b Berke Gerald S Long Jennifer L 2010 01 01 Brudzynski Stefan M ed Chapter 10 1 Functions of the larynx and production of sounds Handbook of Behavioral Neuroscience Handbook of Mammalian Vocalization Elsevier vol 19 pp 419 426 doi 10 1016 B978 0 12 374593 4 00038 3 retrieved 2021 01 12 a b c Bentivoglio Anna Rita Fasano Alfonso Albanese Alberto 2009 01 01 Jankovic Joseph Albanese Alberto Atassi M Zouhair Dolly J Oliver eds 10 Botulinum Neurotoxin in Tremors Tics Hemifacial Spasm Spasmodic Dysphonia and Stuttering Botulinum Toxin Philadelphia W B Saunders pp 112 130 doi 10 1016 b978 1 4160 4928 9 00010 x ISBN 978 1 4160 4928 9 retrieved 2021 01 12 Retrieved from https en wikipedia org w index php title Cricothyroid muscle amp oldid 1166443643, wikipedia, wiki, book, books, library,

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