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Related Concept Videos

The Vestibular System01:29

The Vestibular System

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The vestibular system is a set of inner ear structures that provide a sense of balance and spatial orientation. This system is comprised of structures within the labyrinth of the inner ear, including the cochlea and two otolith organs—the utricle and saccule. The labyrinth also contains three semicircular canals—superior, posterior, and horizontal—that are oriented on different planes.
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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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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 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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Related Experiment Video

Updated: Apr 19, 2026

Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process
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Cochlear implantation and vestibular function in children.

Briac Thierry1, Marion Blanchard1, Nicolas Leboulanger1

  • 1Department of Otolaryngology, Head and Neck Surgery, Necker Children's Hospital, 149, rue de Sèvres, 75 015 Paris, France.

International Journal of Pediatric Otorhinolaryngology
|December 16, 2014
PubMed
Summary
This summary is machine-generated.

Cochlear implantation (CI) in children can impact vestibular function (VF), with some cases showing worsening after surgery. Pre-existing inner ear issues and specific hearing loss causes increase the risk of abnormal VF post-CI.

Keywords:
ChildrenCochlear implantationDeafnessVestibular testing

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Area of Science:

  • Pediatric Otolaryngology
  • Neurotology
  • Vestibular System Assessment

Background:

  • Vestibular function (VF) is crucial for balance and spatial orientation.
  • Cochlear implantation (CI) is a common treatment for pediatric hearing loss.
  • The impact of CI on pediatric VF requires further investigation.

Purpose of the Study:

  • To analyze vestibular function (VF) changes in children following cochlear implantation (CI).
  • To identify factors associated with vestibular dysfunction after CI in pediatric patients.

Main Methods:

  • Retrospective cohort study of 43 children undergoing unilateral CI.
  • Vestibular testing (VT) including head-impulse, caloric, and VEMP tests.
  • Grading of VF (normal, partial dysfunction, severe dysfunction/areflexia) and analysis by implantation side, etiology, and preoperative status.

Main Results:

  • 16% of children had bilateral inner ear malformations.
  • Pre-operative VF was abnormal in 50% of cases.
  • Post-operative VT showed normal responses in 48.8% and dysfunction (type 2&3) in 16.2% of patients.
  • 19% had poorer VF on the CI side, while 75% had normal contralateral VF.
  • Hearing loss etiologies like Usher syndrome, meningitis, and inner ear malformations were linked to higher rates of abnormal VF (p=0.01).

Conclusions:

  • Half of the children presented with initial vestibular dysfunction.
  • Approximately 20% of pediatric CI cases may lead to worsened vestibular function.
  • A structured, three-step VF evaluation is proposed for easier comparison and clinical decision-making in pediatric CI.