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Videos de Conceptos Relacionados

Auditory Pathway01:15

Auditory Pathway

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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
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Anatomy of the Ear01:16

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Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...
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The Cochlea01:13

The Cochlea

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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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Hair Cells01:22

Hair Cells

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Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
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Hearing01:31

Hearing

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When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
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The Auditory Ossicles01:11

The Auditory Ossicles

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The auditory ossicles of the middle ear transmit sounds from the air as vibrations to the fluid-filled cochlea. The auditory ossicles consist of two malleus (hammer) bones, two incus (anvil) bones, and two stapes (stirrups), one on each side. These bones develop during the fetal stage and are the ones to ossify first. They are fully mature at birth and do not grow afterward.
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...
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Video Experimental Relacionado

Updated: Sep 9, 2025

Dextran Labeling and Uptake in Live and Functional Murine Cochlear Hair Cells
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Membrana tectorial: estructura, función y sus implicaciones para la pérdida auditiva

Panpan Bian1, Jiong Dang1, Bai-Cheng Xu1

  • 1Department of Otolaryngology-Head & Neck Surgery, The Second Hospital & Clinical Medical School, Lanzhou University, Lanzhou, Gansu, China.

Frontiers in neurology
|September 3, 2025
PubMed
Resumen
Este resumen es generado por máquina.

La membrana tectorial (TM) es crucial para la audición. Las alteraciones en su estructura, causadas por la genética o el envejecimiento, conducen a la pérdida de audición, pero las nuevas terapias como la terapia génica son prometedoras.

Palabras clave:
envejecimientoLa cócleamutaciones genéticaspérdida de audiciónOtotoxicidadmembrana tectorialhormonas tiroideas

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Área de la Ciencia:

  • Otorrinolaringología
  • Biología celular
  • La genética

Sus antecedentes:

  • La membrana tectorial (TM) es una matriz extracelular vital en la cóclea, esencial para el procesamiento auditivo.
  • Su papel preciso en la mecánica coclear y la amplificación del sonido es crítico para la audición.
  • Los mecanismos subyacentes a la pérdida auditiva relacionada con la membrana tectorial no se comprenden completamente.

Objetivo del estudio:

  • Revisar la estructura y la función de la membrana tectorial.
  • Explorar el papel de la MT en la mecánica coclear y la amplificación de la señal auditiva.
  • Discutir los factores que contribuyen a la disfunción de la MT y las posibles estrategias terapéuticas.

Principales métodos:

  • Revisión de la literatura de estudios sobre la estructura de la membrana tectorial, la función y la pérdida de audición.
  • Análisis de los factores genéticos, el envejecimiento y las influencias hormonales en la integridad de la MT.
  • Examen de los enfoques diagnósticos y terapéuticos actuales y emergentes.

Principales resultados:

  • Las anomalías en la composición de TM (colágeno, glicosaminoglicanos, proteínas) están relacionadas con la pérdida de audición.
  • Las mutaciones en genes como TECTA, TECTB y CEACAM16 interrumpen la integridad de TM, causando pérdida auditiva neurosensorial.
  • El envejecimiento y la deficiencia de hormonas tiroideas contribuyen a la degeneración de la TM.

Conclusiones:

  • La integridad de la membrana tectorial es fundamental para la audición normal.
  • Las mutaciones genéticas, el envejecimiento y los desequilibrios hormonales afectan significativamente la estructura y la función de TM.
  • La terapia génica y la terapia con células madre representan tratamientos futuros prometedores para la pérdida auditiva relacionada con la MT.