Human cortical motor representation of the larynx as assessed by transcranial magnetic stimulation (TMS).
Laryngoscope
; 114(5): 918-22, 2004 May.
Article
em En
| MEDLINE
| ID: mdl-15126757
ABSTRACT
OBJECTIVES:
To analyze characteristic features and details on motor-evoked potentials (MEPs) of the cricothyroid and vocalis muscles from single-pulse cortical transcranial magnetic stimulation (TMS) in normal subjects to characterize cortical motor representation of laryngeal muscles. STUDYDESIGN:
Prospective, experimental investigation on healthy volunteers.METHOD:
MEPs of the cricothyroid and vocalis muscles elicited by cortical TMS with a figure-8-shaped coil were investigated in two groups of six healthy subjects each, with special regard to MEP amplitude as a function of the coil position on the head surface along the interaural line.RESULTS:
Bilateral reproducible responses of the cricothyroid and the vocalis muscles could be observed in all subjects. For the cricothyroid muscle, maximal responses were obtained at mean stimulus positions of 7.5 +/- 1.4 cm (contralateral) and of 7.3 +/- 1.3 cm (ipsilateral), respectively. For the vocalis muscle, we found maximal responses at mean stimulus positions of 10.3 +/- 1.9 cm (contralateral) and of 9.6 +/- 1.6 cm (ipsilateral), respectively. Despite a considerable overlap of these coil positions, from which reproducible MEPs could be elicited in both groups of the laryngeal muscles, statistically significant separation of the cricothyroid-and vocalis-associated cortical representation areas was possible.CONCLUSIONS:
Our observations point to two different cortical motor representation areas, with the cricothyroid muscle-related area being located more medially.
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Base de dados:
MEDLINE
Assunto principal:
Magnetoencefalografia
/
Laringe
Limite:
Adult
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Ano de publicação:
2004
Tipo de documento:
Article