Acoustic Tensor Tympani Response and Vestibular‐Evoked Myogenic Potential

Ochi, Kentaro; Ohashi, Toru; Kinoshita, Hirotsugu

doi:10.1097/00005537-200212000-00018

Cited by 35 publications

(23 citation statements)

References 12 publications

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“…A través de electromiografía y pruebas genéticas, en otras especies se ha observado, igual que el músculo estapedial, el músculo tensor del tímpano ha mostrado ser un músculo con propiedades contráctiles especiales y resistente a la fatiga debido a su composición de fibras glicoliticas oxidativas rápidas, lo que se ajusta a la demanda mecánica del estimulo acústico, respondiendo de manera constante e inmediata al estimulo acústico de intensidad entre 70-100 dB y frecuencia de 2 KHz 31,32 . Según Ochi y col 33 , la actividad del músculo tensor del tímpano, además del reflejo centrífugo originado en la coclea, puede ser evocada igualmente desde orígenes somato-sensoriales o sensori-vestibulares. Las aferencias sensoriales de sitios periféricos (inervados por el trigémino) como la membrana timpánica (por la estimulación de la energía acústica) o la corneal (reflejo corneal), evocan la actividad del músculo tensor del tímpano y, a su vez, una deflexión invertida ipsilateral de la membrana timpánica (reflejo acústico ipsilateral invertido).…”

Section: A R T í C U L Ounclassified

Síntomas óticos referidos en desórdenes temporomandibulares. Relación con músculos masticatorios

2007

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Otological symptoms among patients with temporomandibular joint disordersCorrespondencia a: Dr. Luis Miguel Ramirez, Fax: (097) 6479668. E mail: lmra3@yahoo.com L a mayoría de los personas con desórdenes temporomandibulares (DTM) sufren de dolor muscular crónico de tipo local, que afectan los músculos orofaciales y también pueden producir dolor y sintomatología no dolorosa de tipo referida, que puede llegar a afectar la musculatura cervical y la musculatura del oído medio, con síntomas óticos variados, que incluyen vértigo, tinitus, sensación de oído tapado, hiper o hipoacusia y otalgia. Múltiples posibilidades anató-micas o neurológicas que, a partir de una disfunción muscular o articular, pueden generar condiciones óticas, no parecieran corresponder con los hallazgos clínicos al momento de la valoración 1 . Estas posibles vías atañen tanto el enfoque puramente descriptivo de estructuras anatómicas en común para la articulación temporomandibular (ATM) y el oído, así como también vecindades entre estructuras musculares y el oído medio 2 . Esta revisión pretende desarrollar bajo un enfoque principalmente anatómico y neuroanató-

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Section: A R T í C U L Ounclassified

Síntomas óticos referidos en desórdenes temporomandibulares. Relación con músculos masticatorios

2007

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“…The stapedius in humans is the primary middle ear muscle that contracts in response to sound (Brask 1979;Ochi et al 2002). The contraction of the stapedius muscle decreases the transmission of sound into the inner ear (Gelfand 2002), and this action is protective (Hilding 1960;Brask 1979).…”

Section: Introductionmentioning

confidence: 99%

Diverse Synaptic Terminals on Rat Stapedius Motoneurons

Lee

Benson

Brown

2008

JARO

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Stapedius motoneurons (SMN) mediate the contraction of the stapedius muscle, which protects the inner ear from injury and reduces the masking effects of background noise. A variety of inputs to SMNs are known to exist, but their terminal ultrastructure has not been investigated. We characterized the synaptic terminals on retrogradely labeled SMNs found just ventromedial to the facial motor nucleus. About 80% of the terminals contained round synaptic vesicles. One type (Sm Rnd) had small, round vesicles filling the terminal with occasional dense core vesicles and formed an asymmetric synapse. Sm Rnd terminals were small with lengths of apposition to the SMN less than 3 μm. Partial reconstructions from serial sections demonstrated that these terminals formed up to three synapses per terminal. Another terminal type (Lg Rnd) had large, round vesicles and asymmetric synapses. Most Lg Rnd terminals were small but some were extensive, e.g., abutting the SMN for up to 10 μm. One of these terminals formed at least seven synapses. Another terminal type (Pleo) had pleomorphic vesicles and symmetric active zones that, in some cases, were invaginated by spines from the SMN. A fourth uncommon terminal type (Het Rnd) had round vesicles of heterogeneous sizes and asymmetric synapses. A fifth rare terminal type (Cist) had large, round vesicles and an accompanying subsurface cistern in the SMN. These were generally the same kinds of terminals found on other motoneurons, but the high proportion of round vesicle synapses indicate that SMNs receive mostly excitatory inputs.

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“…Even if its structure is yet to be completely understood, given the little time since the scientific world has gotten an interest in this topic, the analysis of this reflex has brought about growing support to the diagnosis of severe pathologic conditions, such as tumors in the acoustic nerve (vestibular neuritis), Meniere's disease, multiple sclerosis and sensorineural hearing loss [41][42][43][44][45] .…”

Section: Discussionmentioning

confidence: 99%

Potenciais miogênicos evocados vestibulares: metodologias de registro em homens e cobaias

Oliveira

David

Colafêmina

2008

Rev. Bras. Otorrinolaringol.

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The vestibular evoked myogenic potential (VEMP) is a clinical test that assess the vestibular function by means of an inhibitory vestibulo-neck reflex, recorded in body muscles in response to high intensity acoustic stimuli. Aim: To check and analyze the different methods used to record VEMPs in humans and in guinea pigs. Materials and Methods: We researched the following databases: MEDLINE, LILACS, SCIELO and COCHRANE. Results: we noticed discrepancies in relation to the ways used to record the vestibular evoked myogenic potentials in relation to the following factors: patient position at the time of recording, type of sound stimulus used (clicks or tone bursts), parameters for stimuli mediation (intensity, frequency, duration of presentation, filters, response amplification gain and windows for stimulus recording), type of phone used and way of stimulus presentation (mono or binaural, ipsi or contralateral). Conclusion: There is no consensus in the literature as to the best recording method for vestibular evoked myogenic potentials. We need more specific studies in order to compare these recordings and establish a standard model to use it in the clinical practice.

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Acoustic Tensor Tympani Response and Vestibular‐Evoked Myogenic Potential

Cited by 35 publications

References 12 publications

Síntomas óticos referidos en desórdenes temporomandibulares. Relación con músculos masticatorios

Síntomas óticos referidos en desórdenes temporomandibulares. Relación con músculos masticatorios

Diverse Synaptic Terminals on Rat Stapedius Motoneurons

Potenciais miogênicos evocados vestibulares: metodologias de registro em homens e cobaias

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