Influence and interactions of laryngeal adductors and cricothyroid muscles on fundamental frequency and glottal posture control

Chhetri, Dinesh K.; Neubauer, Juergen; Sofer, Elazar; Berry, David A.

doi:10.1121/1.4865918

Cited by 38 publications

(58 citation statements)

References 31 publications

(54 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Vocal range profiles (SPL versus F0) obtained from the middle of the stable phonatory onset mode are shown in Figures and for TA, LCA/IA, and CT activation levels, and for Psub. Fundamental frequency was divided into lower and higher register, as reported previously in Chhetri . In the lower register (Fig.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Interactions of subglottal pressure and neuromuscular activation on fundamental frequency and intensity

Chhetri

Park

2016

The Laryngoscope

Self Cite

View full text Add to dashboard Cite

Objectives Fundamental frequency (F0) and intensity (SPL) of voice are controlled by intrinsic laryngeal muscle (ILM) activation and subglottal pressure (Psub). Their interactions were investigated.s Methods In an in vivo canine model, the thyroarytenoid (TA), lateral cricoarytenoid/interarytenoid (LCA/IA), and the cricothyroid (CT) muscles were independently activated from threshold to maximal contraction by neuromuscular stimulation in various combinations while airflow was increased to phonation onset pressure and beyond. The resultant acoustic output was analyzed for effects of Psub on vibratory stability, F0 and SPL. Muscle activation plots and vocal range profiles by individual ILM activation states were analyzed. Results CT activation increased phonation onset F0, but vibration was less stable in high CT conditions and displayed vibratory mode change. In addition, in high CT conditions, a decrease in F0 with increased Psub was observed. SPL increased with Psub in all conditions but the slope was greater at high CT, low TA/LCA/IA activations. LCA/IA activation improved vocal efficiency. To maintain same F0 with increasing SPL (messa di voce), TA activation was decreased and LCA/IA activation was increased. The same F0 and SPL could be achieved with a variety of ILM activation combinations. Conclusions CT is primarily required for increasing F0, while TA can increase or decrease F0 and SPL. LCA/IA likely maintains vocal fold adduction during increased Psub and improves vocal efficiency. This study also demonstrates laryngeal motor equivalence, the ability of the larynx to achieve the same target F0 and SPL with multiple combinations of ILM activation.

show abstract

Section: Resultsmentioning

confidence: 99%

“…An in vivo canine model was used as previously described . The study protocol was approved by the Institutional Animal Research Committee.…”

Section: Methodsmentioning

confidence: 99%

Interactions of subglottal pressure and neuromuscular activation on fundamental frequency and intensity

Chhetri

Park

2016

The Laryngoscope

Self Cite

View full text Add to dashboard Cite

show abstract

“…21 In our previous investigations on F0 control using the in vivo canine model we have found fundamental frequencies ranging from 80 Hz to776 Hz, which covers the human speaking and singing range very well. 3, 22 Therefore, the material properties of the cover layer and the neuromuscular anatomy of the canine larynx makes it a suitable externally valid model to study laryngeal physiology.…”

Section: Discussionmentioning

confidence: 99%

Young's Modulus of Canine Vocal Fold Cover Layers

Chhetri

Rafizadeh

2014

Journal of Voice

Self Cite

View full text Add to dashboard Cite

Objectives The objective of this study was to measure the elastic modulus (Young’s modulus) of canine vocal fold cover layers. Study Design Basic science study. Methods Cover layers from vocal folds of eight canine larynges were dissected. Cover layer samples from the mid-membranous, medial vocal fold surface area were used to measure material stiffness using a previously validated indentation method. Cover layers from two human larynges were also measured as control references. Superior and inferior medial cover layers were measured separately. A total of 15 superior medial surface and 17 inferior medial surface specimens from the canine, and 2 and 4 specimens respectively from the human, were tested. Results In the canine larynges, the mean Young’s modulus of the superior medial surface was 4.2 kPa (range 3.0 kPa – 5.4 kPa, SD 0.6 kPa), and of the inferior medial surface was 6.8 kPa (range 5.4 – 8.5 kPa, SD 0.8 kPa). Measurements on human cover samples were 5.0 kPa (range 4.7 – 5.4 kPa, SD 0.5 kPa) and 7.0 kPa (range 6.7 – 7.3 kPa, SD 0.3 kPa) for the superior medial and inferior medial surface, respectively. Human measurements were similar to the previously validated measurements. There was no difference between the stiffness measurements in the human and canine cover layer samples (p>0.05). Conclusions The elastic stiffness (Young’s modulus) of the canine and human vocal fold cover layers is similar. Findings support the use of canine larynx as an externally valid model to study voice production.

show abstract

“…One male mongrel dog, 20 months old, was used in this study. Surgical exposure of the larynx and the recurrent laryngeal nerves (RLN) and superior laryngeal nerves (SLN) was as described previously 1314 . The nerve branches to the posterior cricoarytenoid (PCA) muscle, Galen’s anastomosis, and the internal superior laryngeal nerve branches were divided bilaterally to eliminate their effects during nerve stimulation.…”

Section: Methodsmentioning

confidence: 99%

Neuromuscular compensation mechanisms in vocal fold paralysis and paresis

et al. 2017

Self Cite

View full text Add to dashboard Cite

Introduction Vocal fold paresis and paralysis are common conditions. Treatment options include augmentation laryngoplasty and voice therapy. The optimal management for this condition is unclear. The objective of this study was to assess possible neuromuscular compensation mechanisms that could potentially be used in the treatment of vocal fold paresis and paralysis. Methods In an in vivo canine model we examined three conditions: (1) unilateral right recurrent laryngeal nerve (RLN) paresis and paralysis, (2) unilateral superior laryngeal nerve paralysis (SLN), and (3) unilateral vagal nerve paresis and paralysis. Phonatory acoustics and aerodynamics were measured in each of these conditions. Effective compensation was defined as improved acoustic and aerodynamic profile. Results The most effective compensation for all conditions was increasing RLN activation and decreasing glottal gap. Increasing RLN activation increased the percentage of possible phonatory conditions that achieved phonation onset. SLN activation generally led to decreased number of total phonation onset conditions within each category. Differential effects of SLN (CT muscle) activation were seen: Ipsilateral SLN activation could compensate for RLN paralysis, normal CT compensated well in unilateral SLN paralysis, and in vagal paresis/paralysis contralateral SLN and RLN display antagonistic relationships. Conclusions Methods to improve glottal closure should be the primary treatment for large glottal gaps. Neuromuscular compensation is possible for paresis. This study provides insights into possible compensatory mechanisms in vocal fold paresis and paralysis.

show abstract

Influence and interactions of laryngeal adductors and cricothyroid muscles on fundamental frequency and glottal posture control

Cited by 38 publications

References 31 publications

Interactions of subglottal pressure and neuromuscular activation on fundamental frequency and intensity

Interactions of subglottal pressure and neuromuscular activation on fundamental frequency and intensity

Young's Modulus of Canine Vocal Fold Cover Layers

Neuromuscular compensation mechanisms in vocal fold paralysis and paresis

Contact Info

Product

Resources

About