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Related Concept Videos

The Cochlea01:13

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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 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.
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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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Contralateral Cochlear Labyrinthine Concussion without Temporal Bone Fracture: Unusual Posttraumatic Consequence.

I M Villarreal1, D Méndez1, J M Duque Silva1

  • 1Otorhinolaryngology Department, "Móstoles" University Hospital, Madrid, Spain.

Case Reports in Otolaryngology
|October 15, 2016
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Summary
This summary is machine-generated.

Contralateral labyrinthine concussion, a rare cause of hearing loss after head trauma, can occur without temporal bone fractures. This case highlights unusual contralateral sensorineural hearing loss following blunt head injury.

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Area of Science:

  • Neurology
  • Otolaryngology

Background:

  • Labyrinthine concussion is a rare cause of sensorineural hearing loss post-head trauma.
  • Isolated inner ear damage without vestibular involvement is termed cochlear labyrinthine concussion.
  • Hearing loss is common with petrous bone fractures, typically ipsilateral to injury.

Purpose of the Study:

  • To report a rare case of contralateral sensorineural hearing loss after head trauma.
  • To emphasize the diagnostic approach for temporal bone trauma.

Main Methods:

  • Case report of a 37-year-old patient with contralateral hearing loss after blunt head trauma.
  • Clinical examination including otoscopy and radiological imaging (high-resolution computed tomography).
  • Neurotologic examination to assess hearing function.

Main Results:

  • The patient presented with severe right-sided sensorineural hearing loss and tinnitus after left-sided temporal bone trauma.
  • Otoscopy and radiological scans revealed no temporal bone fractures or abnormalities.
  • Hearing in the left ear remained normal.

Conclusions:

  • Temporal bone trauma necessitates a comprehensive diagnostic evaluation, including neurotologic assessment and high-resolution computed tomography.
  • Contralateral hearing loss following head injury is rare, especially without associated fractures.
  • This case underscores the unusual presentation of labyrinthine concussion.