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Related Concept Videos

Anatomy of the Ear01:16

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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 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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The Vestibular System01:29

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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 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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Classification and Current Management of Inner Ear Malformations.

Levent Sennaroğlu1, Münir Demir Bajin1

  • 1Department of Otolaryngology, Hacettepe University School of Medicine, Ankara, Turkey.

Balkan Medical Journal
|August 26, 2017
PubMed
Summary

Congenital sensorineural hearing loss stems from membranous or bony malformations. Bony malformations present surgical challenges, influencing treatment decisions and outcomes for auditory implantation.

Keywords:
Inner ear malformationsclassificationcochlear hypoplasiacochleovestibular malformationsincomplete partitionradiology surgery.treatment

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Area of Science:

  • Otolaryngology
  • Medical Imaging
  • Genetics

Background:

  • Congenital sensorineural hearing loss (CSNH) is categorized morphologically into membranous and bony malformations.
  • Membranous malformations (80%) affect inner ear hair cells with normal bony structures, showing typical imaging results.
  • Bony labyrinth malformations (20%) involve structural abnormalities detectable by advanced imaging.

Purpose of the Study:

  • To review and classify inner ear malformations based on cochlear morphology.
  • To discuss the diagnostic role of high-resolution computerized tomography (HRCT) and magnetic resonance imaging (MRI).
  • To explore surgical challenges and auditory implantation outcomes in relation to cochlear nerve status.

Main Methods:

  • Review of existing literature on congenital sensorineural hearing loss.
  • Classification of inner ear malformations based on cochlear morphology.
  • Analysis of imaging findings (HRCT, MRI) in relation to malformation types.

Main Results:

  • Two main categories of CSNH: membranous (80%) and bony (20%) malformations.
  • Bony malformations require advanced imaging and present significant surgical and management complexities.
  • Auditory outcomes are linked to cochlear nerve status, necessitating a classification of cochlear nerve deficiency.

Conclusions:

  • Accurate classification of inner ear malformations is crucial for surgical planning and patient management.
  • Understanding the interplay between malformation type, surgical approach, and auditory outcomes is essential.
  • A practical classification of cochlear nerve deficiency aids in predicting hearing and language development post-implantation.