The thyroarytenoid muscle is a broad, thin muscle that forms the body of the vocal fold and that supports the wall of the ventricle and its appendix. It functions to shorten the vocal folds.
Its fibers pass backward and laterally, to be inserted into the base and anterior surface of the arytenoid cartilage.
Partsedit
The lower and deeper fibers of the muscle can be differentiated as a triangular band which is inserted into the vocal process of the arytenoid cartilage, and into the adjacent portion of its anterior surface; it is termed the Vocalis, and lies parallel with the vocal ligament, to which it is adherent.[1]
The vocal muscle is the upper portion of the thyroarytenoid muscle which is primarily involved in producing speech.
A considerable number of the fibers of the thyroarytenoid muscle are prolonged into the aryepiglottic fold, where some of them become lost, while others are continued to the margin of the epiglottis. They have received a distinctive name, thyroepiglottic muscle, thyreoepiglotticus or thyroepiglottic, and are sometimes described as a separate muscle.
A few fibers extend along the wall of the ventricle from the lateral wall of the arytenoid cartilage to the side of the epiglottis and constitute the ventricularis muscle.
Functionedit
The thyroarytenoid muscle, consisting of two parts having different attachments and different directions, is rather complicated regarding its action.
Its main use is to draw the arytenoid cartilages forward toward the thyroid, thus relaxing and shortening the vocal folds.
But, owing to the connection of the deeper portion with the vocal fold, this part, if acting separately, is supposed to modify its elasticity and tension, while the lateral portion rotates the arytenoid cartilage inward, and thus narrows the rima glottidis by bringing the two vocal folds together.
Additional imagesedit
Muscles of larynx. Side view. Right lamina of thyroid cartilage removed.
Cross sectional cut of vocalis muscle
Referencesedit
This article incorporates text in the public domain from page 1083 of the 20th edition ofGray's Anatomy(1918)
^Frank H. Netter, MD "Atlas of Human anatomy", 7th Edition, 2019, Plate 91, superior view
External linksedit
Anatomy photo:32:st-0605 at the SUNY Downstate Medical Center
Atlas image: rsa4p5 at the University of Michigan Health System
thyroarytenoid, muscle, thyroarytenoid, muscle, broad, thin, muscle, that, forms, body, vocal, fold, that, supports, wall, ventricle, appendix, functions, shorten, vocal, folds, muscles, larynx, seen, from, above, detailsorigininner, surface, thyroid, cartilag. The thyroarytenoid muscle is a broad thin muscle that forms the body of the vocal fold and that supports the wall of the ventricle and its appendix It functions to shorten the vocal folds Thyroarytenoid muscleMuscles of the larynx seen from above DetailsOriginInner surface of the thyroid cartilage anterior aspect InsertionAnterior surface of arytenoid cartilageNerveRecurrent laryngeal branch of the vagusActionsHelps to reduce tension on the vocal folds during speech to decrease pitchIdentifiersLatinmusculus thyroarytenoideusTA98A06 2 08 008TA22199FMA46588Anatomical terms of muscle edit on Wikidata Contents 1 Structure 1 1 Parts 2 Function 3 Additional images 4 References 5 External linksStructure editIt arises in front from the lower half of the angle of the thyroid cartilage and from the middle cricothyroid ligament Its fibers pass backward and laterally to be inserted into the base and anterior surface of the arytenoid cartilage Parts edit The lower and deeper fibers of the muscle can be differentiated as a triangular band which is inserted into the vocal process of the arytenoid cartilage and into the adjacent portion of its anterior surface it is termed the Vocalis and lies parallel with the vocal ligament to which it is adherent 1 The vocal muscle is the upper portion of the thyroarytenoid muscle which is primarily involved in producing speech A considerable number of the fibers of the thyroarytenoid muscle are prolonged into the aryepiglottic fold where some of them become lost while others are continued to the margin of the epiglottis They have received a distinctive name thyroepiglottic muscle thyreoepiglotticus or thyroepiglottic and are sometimes described as a separate muscle A few fibers extend along the wall of the ventricle from the lateral wall of the arytenoid cartilage to the side of the epiglottis and constitute the ventricularis muscle Function editThe thyroarytenoid muscle consisting of two parts having different attachments and different directions is rather complicated regarding its action Its main use is to draw the arytenoid cartilages forward toward the thyroid thus relaxing and shortening the vocal folds But owing to the connection of the deeper portion with the vocal fold this part if acting separately is supposed to modify its elasticity and tension while the lateral portion rotates the arytenoid cartilage inward and thus narrows the rima glottidis by bringing the two vocal folds together Additional images edit nbsp Muscles of larynx Side view Right lamina of thyroid cartilage removed nbsp Cross sectional cut of vocalis muscleReferences edit nbsp This article incorporates text in the public domain from page 1083 of the 20th edition of Gray s Anatomy 1918 Frank H Netter MD Atlas of Human anatomy 7th Edition 2019 Plate 91 superior viewExternal links editAnatomy photo 32 st 0605 at the SUNY Downstate Medical Center Atlas image rsa4p5 at the University of Michigan Health System Portal nbsp Anatomy Retrieved from https en wikipedia org w index php title Thyroarytenoid muscle amp oldid 1187665545, wikipedia, wiki, book, books, library,
