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Related Concept Videos

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

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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 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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Related Experiment Video

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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Eocene evolution of whale hearing.

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
Summary

Early whale evolution shows significant changes in hearing mechanisms. Fossil evidence reveals a transition from unsophisticated hearing in early cetaceans to a more specialized aquatic auditory system.

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Area of Science:

  • Paleontology
  • Evolutionary Biology
  • Comparative Anatomy

Background:

  • The transition of early whales (Cetacea) to a marine environment involved significant adaptations across organ systems.
  • Understanding the evolutionary trajectory of these adaptations provides insights into macroevolutionary processes.

Purpose of the Study:

  • To document the evolutionary changes in the sound transmission mechanism of the outer and middle ear in early whales.
  • To analyze the auditory adaptations during the transition from terrestrial to obligately marine lifestyles in cetaceans.

Main Methods:

  • Analysis of the fossil record of early whale species, including pakicetids, remingtonocetids, and protocetids.
  • Comparative examination of the outer and middle ear structures related to sound transmission.

Main Results:

  • Early whale auditory systems evolved rapidly, undergoing significant changes within 15 million years.
  • Pakicetids show an intermediate stage with rudimentary hearing in both air and water.
  • Remingtonocetids and protocetids developed a sound transmission mechanism resembling modern toothed whales, yet retaining some terrestrial auditory features.

Conclusions:

  • The evolution of hearing in early whales demonstrates distinct trajectories for different organ systems.
  • The auditory adaptations reflect a complex transition towards specialized marine sound reception.