Malamud-Kessler C, Estañol-Vidal B, Ayala-Anaya S, Sentíes-Madrid H, Hernández-Camacho MA

Idioma: Español
Referencias bibliográficas: 49
Paginas: 163-170
Archivo PDF: 244.99 Kb.

RESUMEN

Los mecanorreceptores cutáneos son esenciales para la percepción sensorial vibro-táctil. La percepción vibro-táctil depende principalmente de los mecanorreceptores de adaptación rápida (corpúsculos de Pacini y Meissner) y lenta (discos de Merkel). La sensibilidad vibratoria en la periferia tiene distintas características dependiendo de la región corporal que reciba su aferencia. Desde el punto de vista mecánico el sinusoide vibratorio posee distintas características (amplitud y frecuencia de disparo), que le confieren distintas propiedades y que generarán distintas características de la percepción vibro-táctil. La vía de transmisión del estímulo vibratorio consta de cuatro relevos conocidos que conservan una distribución somatotópica a lo largo del trayecto, y la codificación de las características vibro-mecánicas le confieren propiedades específicas. A nivel cortical, parece ser que el área somatosensorial secundaria (SII) recibe principalmente aferencias de los mecanorreceptores de alta frecuencia capaces de discriminar tanto la frecuencia como la amplitud (tono) del estímulo vibratorio. Finalmente, se reconoce que existe una coactivación de la corteza de asociación auditiva que depende tanto de las propiedades intrínsecas de la vibración (frecuencia, amplitud y duración) como de la retroalimentación del entorno.

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