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Related Concept Videos

Auditory Pathway01:15

Auditory Pathway

6.0K
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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The Cochlea01:13

The Cochlea

47.5K
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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Overview of Somatic Sensory Pathways01:29

Overview of Somatic Sensory Pathways

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Somatic sensory or somatosensory pathways refer to the neural pathways that carry information related to touch, pressure, pain, temperature, and proprioception from the skin, muscles, tendons, and joints to the brain. These pathways involve several stages of processing and integration of sensory information.
The somatosensory system is divided into three main pathways: the dorsal (or posterior) column-medial lemniscus, spinothalamic (or anterolateral), and spinocerebellar pathways.
The dorsal...
6.5K
Major Somatic Sensory Pathways01:28

Major Somatic Sensory Pathways

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Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the...
1.4K
Hair Cells01:22

Hair Cells

42.3K
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.
42.3K
Equilibrium and Balance01:15

Equilibrium and Balance

5.2K
The inner ear assumes dual functionalities of auditory perception and equilibrium maintenance. The vestibule is the organ responsible for balance. This organ contains mechanoreceptors, specifically hair cells, endowed with stereocilia, which aid in deciphering information regarding the position and motion of our heads. Two intrinsic components, the utricle and saccule, help perceive head position, while the semicircular canals track head movement. Neurological messages initiated in the...
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Related Experiment Video

Updated: Oct 18, 2025

Physiological Preparation of Hair Cells from the Sacculus of the American Bullfrog Rana catesbeiana
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Bone conduction pathways confer directional cues to salamanders.

G Capshaw1, J Christensen-Dalsgaard2, D Soares3

  • 1Department of Biology, University of Maryland, College Park, MD 20742, USA.

The Journal of Experimental Biology
|September 28, 2021
PubMed
Summary
This summary is machine-generated.

Early tetrapods likely heard airborne sounds using nontympanic mechanisms. This study shows that atympanate salamanders use head vibrations for directional hearing in air, demonstrating an effective extratympanic pathway.

Keywords:
AmphibianExtratympanicHearingSound localization

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Area of Science:

  • Bioacoustics
  • Evolutionary Biology
  • Comparative Physiology

Background:

  • Acoustic cues are vital for survival, with early vertebrates possessing directional ears.
  • Early terrestrial tetrapods lacked tympana, suggesting reliance on nontympanic hearing mechanisms.
  • Understanding extratympanic sound detection is crucial for reconstructing early tetrapod sensory capabilities.

Purpose of the Study:

  • To investigate the efficacy of extratympanic pathways for directional hearing in air.
  • To determine if atympanate species can detect and localize airborne sound without a tympanum.
  • To elucidate the mechanisms of non-tympanic sound reception in terrestrial environments.

Main Methods:

  • Utilized atympanate salamanders as a model for early terrestrial hearing.
  • Employed directionally masked auditory brainstem response recordings to assess peripheral encoding.
  • Measured sound pressure-induced head vibrations using laser Doppler vibrometry.

Main Results:

  • Sound generates head vibrations in atympanate salamanders that are dependent on the incident sound angle.
  • Directional auditory sensitivity follows a figure-eight pattern, indicating effective sound localization.
  • Extratympanic pathways are sufficient for directional hearing in air, even without a tympanum.

Conclusions:

  • Atympanate salamanders possess a functional extratympanic hearing system for directional sound detection in air.
  • Head vibration sensitivity provides a viable mechanism for aerial sound reception in the absence of a tympanum.
  • This finding supports hypotheses about nontympanic hearing in early terrestrial vertebrates.