Morphometric and Histochemical Study of the Human Vocal Muscle

Guida, Heraldo Lorena; Zorzetto, Neivo Luiz

doi:10.1177/000348940010900113

Cited by 14 publications

(17 citation statements)

References 15 publications

(22 reference statements)

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“…Due to the lack of a complete understanding of the complex VF histological structure, its muscular and physiological functions have been the subject of many recent studies. Recent morphological studies of VF have confirmed the existence of various distinct muscle bundles 8–10 . Further, the activity of the thyroarytenoid muscle bundle during phonation has been confirmed with electromyography 11 .…”

Section: Introductionmentioning

confidence: 94%

Muscular Anatomy of the Human Ventricular Folds

Moon¹,

Alipour²

2013

Ann Otol Rhinol Laryngol

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Objective The purpose of this study was to better understand the muscular anatomy of the ventricular folds (VF) to help improve biomechanical modeling of phonation and to better understand the role of these muscles during phonatory and non-phonatory tasks. Method Four human larynges were decalcified and sectioned coronally from the posterior to anterior using a CryoJane tape transfer system, and stained using Massons trichrome. The total and relative area of muscles observed in each section were calculated and used for characterizing muscle distribution within the ventricular folds. Results The ventricular folds of the larynges contained anteriorly coursing thyroarytenoid and ventricularis muscle fibers lying in the lower half of the VF posteriorly, with some ventricularis muscle evident in the upper and lateral portion of the fold more anteriorly. Very little muscle tissue was observed in the medial half of the fold, and the anterior half of the VF was largely devoid of any muscle tissue. All four VF’s contained muscle bundles coursing superiorly and medially through the upper half of the fold toward the lateral margin of the epiglottis. Conclusions While variability in expression was evident, the well-defined thyroarytenoid muscle was readily apparent lateral to the arytenoid cartilage in all specimens.

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Section: Introductionmentioning

confidence: 94%

Muscular Anatomy of the Human Ventricular Folds

Moon¹,

Alipour²

2013

Ann Otol Rhinol Laryngol

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“…First, it is traditionally accepted that the speed of vocal onset/offset gestures depends on differences in the contractile times of laryngeal muscles. Pure physiological studies of the intrinsic laryngeal muscles via fiber typing experiments have suggested that the PCA should be one of the fastest muscles in the laryngeal system (Malmgren et al, 1985) and that the TA muscle should be even faster (Teig et al, 1978;Guida and Zorzetto, 2000). Although the model did not dispute these histological findings, it did suggest that the timing of abduction/adduction gestures and the resultant speed from muscle contractions in this complex multimuscle system is also affected by the passive mechanics of the vocal folds.…”

Section: Posturing Observations and Insightsmentioning

confidence: 99%

A three-dimensional model of vocal fold abduction/adduction

Hunter

Titze

Alipour

2004

The Journal of the Acoustical Society of America

116

102

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A three-dimensional biomechanical model of tissue deformation was developed to simulate dynamic vocal fold abduction and adduction. The model was made of 1721 nearly incompressible finite elements. The cricoarytenoid joint was modeled as a rocking-sliding motion, similar to two concentric cylinders. The vocal ligament and the thyroarytenoid muscle's fiber characteristics were implemented as a fiber-gel composite made of an isotropic ground substance imbedded with fibers. These fibers had contractile and/or passive nonlinear stress-strain characteristics. The verification of the model was made by comparing the range and speed of motion to published vocal fold kinematic data. The model simulated abduction to a maximum glottal angle of about 31°. Using the posteriorcricoarytenoid muscle, the model produced an angular abduction speed of 405° per second. The system mechanics seemed to favor abduction over adduction in both peak speed and response time, even when all intrinsic muscle properties were kept identical. The model also verified the notion that the vocalis and muscularis portions of the thyroarytenoid muscle play significantly different roles in posturing, with the muscularis portion having the larger effect on arytenoid movement. Other insights into the mechanisms of abduction/adduction were given.

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“…A análise histológica de músculos vocais laríngeos humanos, em adultos saudáveis, removidos em autópsia demonstra uma composição mista de fibras tipo I (40,5%), tipo IIa (54,75%) e tipo IIb (4,75%), distribuídas em forma de mosaico (4) . A maior frequência de fibras tipo IIa, ou glicolítico-oxidativas, de metabolismo misto, e de fibras tipo I (aeróbicas) nos músculos da laringe, a caracteriza como sendo altamente treinável para se obter mais habilidades aeróbicas e consequentemente maior resistência à fadiga.…”

Section: Introductionunclassified

Avaliação da performance vocal antes e após a vibração sonorizada de língua

Azevedo

Passaglio

Rosseti

et al. 2010

Rev. soc. bras. fonoaudiol.

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OBJETIVO: Verificar o tempo ideal de execução da técnica de vibração sonorizada de língua necessário para interferir nas medidas de perturbação (do ciclo vibratório das pregas vocais) a curto prazo, de frequência fundamental (F0) e intensidade vocal. MÉTODOS: Foram analisadas 43 voluntárias do sexo feminino, na faixa etária de 18 a 31 anos (média de 21,2). Elas foram submetidas a uma triagem realizada por uma fonoaudióloga e por uma médica otorrinolaringologista, para eliminação de possível patologia laríngea e/ou alteração vocal. Foi realizada a gravação de um [a] prolongado, antes da realização da técnica de vibração sonorizada de língua; e depois do primeiro, terceiro e quinto minuto de realização da mesma. Após a coleta dos dados foi realizada a análise acústica, através do software Vox Metria® 1.1, na qual se analisou a F0 média e sua variabilidade, intensidade média e medidas de perturbação a curto prazo. RESULTADOS: Houve aumento na F0 a partir de três minutos da execução da técnica e na intensidade a partir de um minuto. Houve diminuição do ruído a partir de três minutos de realização da técnica. Os parâmetros de variabilidade da F0, jitter, shimmer, nível de ruído glótico e irregularidade não apresentaram diferença entre os períodos comparados. CONCLUSÃO: A técnica de vibração sonorizada de língua foi mais efetiva a partir de três minutos. Os resultados obtidos confirmaram a eficácia da técnica, a qual é vastamente empregada na prática fonoaudiológica, delimitando o tempo ideal para a realização da mesma.

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Morphometric and Histochemical Study of the Human Vocal Muscle

Cited by 14 publications

References 15 publications

Muscular Anatomy of the Human Ventricular Folds

Muscular Anatomy of the Human Ventricular Folds

A three-dimensional model of vocal fold abduction/adduction

Avaliação da performance vocal antes e após a vibração sonorizada de língua

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