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関連する概念動画

Hearing01:31

Hearing

59.0K
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.
59.0K
The Cochlea01:13

The Cochlea

52.7K
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.
52.7K
What is Evolutionary History?02:35

What is Evolutionary History?

45.1K
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.
45.1K
Convergent Evolution01:54

Convergent Evolution

34.7K
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.
34.7K
Anatomy of the Ear01:16

Anatomy of the Ear

14.0K
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...
14.0K
Auditory Pathway01:15

Auditory Pathway

9.1K
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...
9.1K

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関連する実験動画

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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Dissection of the Auditory Bulla in Postnatal Mice: Isolation of the Middle Ear Bones and Histological Analysis

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鯨の聴覚のエオセンの進化

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
まとめ

初期のクジラの進化は,聴覚のメカニズムに大きな変化を示しています. 化石の証拠は,初期のクジラ類の未熟な聴覚から,より特殊な水生聴覚系への移行を明らかにしています.

科学分野:

  • パレオントロジー・パレオントロジー
  • 進化生物学の進化生物学について
  • 比較解剖学 比較解剖学とは

背景:

  • 初期のクジラ (セタセア) が海洋環境への移行は,臓器システム全体に重大な適応を伴いました.
  • これらの適応の進化の軌道を理解することで,マクロ進化の過程についての洞察が得られます.

研究 の 目的:

  • 初期のクジラにおける外耳と中耳の音声伝達機構の進化的変化を記録する.
  • 陸上の生活様式から海洋生活様式への移行中の聴覚的適応をクジラ類で分析する.

主な方法:

  • パキセチド,レミングトノセチド,プロトセチドを含む初期のクジラ種の化石記録の分析.
  • 音の伝達に関連する外耳と中耳の構造の比較試験.

主要な成果:

  • 初期のクジラの聴覚システムは急速に進化し,1500万年以内に大きな変化を経験しました.
  • パキセチドは,空気と水の両方での原始的な聴覚を持つ中間段階を示しています.
  • レミングトノセチドと原始セチドは,現代の歯のあるクジラに似た音声伝達機構を開発したが,陸上の聴覚の特徴の一部を保持した.

結論:

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In Ovo and Ex Ovo Methods to Study Avian Inner Ear Development
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関連する実験動画

Last Updated: Apr 13, 2026

Dissection of the Auditory Bulla in Postnatal Mice: Isolation of the Middle Ear Bones and Histological Analysis
07:40

Dissection of the Auditory Bulla in Postnatal Mice: Isolation of the Middle Ear Bones and Histological Analysis

Published on: January 4, 2017

32.4K
Simple Surgical Induction of Conductive Hearing Loss with Verification Using Otoscope Visualization and Behavioral Clap Startle Response in Rat
06:27

Simple Surgical Induction of Conductive Hearing Loss with Verification Using Otoscope Visualization and Behavioral Clap Startle Response in Rat

Published on: October 26, 2019

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In Ovo and Ex Ovo Methods to Study Avian Inner Ear Development
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In Ovo and Ex Ovo Methods to Study Avian Inner Ear Development

Published on: June 16, 2022

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  • 初期のクジラにおける聴覚の進化は,異なる器官系に異なる軌道を示しています.
  • 聴覚の適応は,専門的な海洋音響受信への複雑な移行を反映しています.