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Related Concept Videos

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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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

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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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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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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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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Issues Concerning the Mechanisms of Bone Conduction.

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Area of Science:

  • Audiology
  • Otoacoustic Emissions
  • Auditory Neuroscience

Background:

  • Air and bone conduction thresholds are standard audiological tests.
  • Bone conduction is traditionally believed to bypass the conductive hearing pathway.
  • This bypass is thought to directly stimulate the inner ear for hearing loss differentiation.

Purpose of the Study:

  • To investigate the precise mechanisms of bone conduction.
  • To re-evaluate the role of bone conduction in differentiating hearing loss types.
  • To explore the involvement of the outer and middle ear in bone conduction transmission.

Main Methods:

  • Review of existing literature on bone conduction mechanisms.
  • Analysis of audiological case studies with varying conductive pathway lesions.
  • Comparison of air and bone conduction threshold data in specific patient groups.

Main Results:

  • Evidence suggests bone conduction mechanisms may involve the outer and middle ear structures.
  • Normal bone conduction thresholds have been observed despite significant conductive pathway impairment.
  • The direct activation of the inner ear via bone conduction is questioned.

Conclusions:

  • The traditional understanding of bone conduction needs revision.
  • Further research is essential to elucidate the complex pathways of bone conduction.
  • Accurate differentiation of hearing loss types may require updated audiological assessment protocols.