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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 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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What is Evolutionary History?02:35

What is Evolutionary History?

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Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.
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Convergent Evolution01:54

Convergent Evolution

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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
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Anatomy of the Ear01:16

Anatomy of the Ear

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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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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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Video Experimental Relacionado

Updated: Apr 13, 2026

Dissection of the Auditory Bulla in Postnatal Mice: Isolation of the Middle Ear Bones and Histological Analysis
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Evolución del eoceno de la audición de las ballenas.

Sirpa Nummela1, J G M Thewissen, Sunil Bajpai

  • 1Department of Anatomy, Northeastern Ohio Universities College of Medicine, Rootstown, Ohio 44272, USA.

Nature
|August 13, 2004
PubMed
Resumen

La evolución temprana de las ballenas muestra cambios significativos en los mecanismos auditivos. La evidencia fósil revela una transición de una audición poco sofisticada en los primeros cetáceos a un sistema auditivo acuático más especializado.

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Área de la Ciencia:

  • Paleontología Paleontología.
  • Biología evolutiva Biología evolutiva.
  • Anatomía comparada y anatomía comparada.

Sus antecedentes:

  • La transición de las primeras ballenas (Cetacea) a un entorno marino implicó adaptaciones significativas en todos los sistemas de órganos.
  • La comprensión de la trayectoria evolutiva de estas adaptaciones proporciona información sobre los procesos macroevolutivos.

Objetivo del estudio:

  • Documentar los cambios evolutivos en el mecanismo de transmisión del sonido del oído externo y medio en las primeras ballenas.
  • Analizar las adaptaciones auditivas durante la transición de los estilos de vida terrestres a los obligatoriamente marinos en los cetáceos.

Principales métodos:

  • Análisis del registro fósil de las primeras especies de ballenas, incluidos los pakicétidos, remingtonocétidos y protocétidos.
  • Examen comparativo de las estructuras del oído externo y medio relacionadas con la transmisión del sonido.

Principales resultados:

  • Los primeros sistemas auditivos de las ballenas evolucionaron rápidamente, experimentando cambios significativos en 15 millones de años.
  • Los paquicétidos muestran una etapa intermedia con una audición rudimentaria tanto en el aire como en el agua.
  • Remingtonocetids y protocetids desarrollaron un mecanismo de transmisión de sonido que se asemeja a las ballenas dentadas modernas, pero conservando algunas características auditivas terrestres.

Conclusiones:

  • La evolución de la audición en las primeras ballenas demuestra trayectorias distintas para diferentes sistemas de órganos.
  • Las adaptaciones auditivas reflejan una transición compleja hacia la recepción especializada de sonido marino.