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Related Concept Videos

The Cochlea01:13

The Cochlea

52.8K
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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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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Role of Ephrin-Eph Signalling in Intestinal Stem Cell Renewal01:22

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Erythropoietin-producing hepatocellular carcinoma receptor (Eph) and its ligand, Eph receptor-interacting protein (Ephrin) were first discovered in the human carcinoma cell line, hence the name. Ephrin-Eph interaction guides cells to reach their appropriate location in adult tissues. They also play an essential role in the immune system by helping in immune cell migration, adhesion, and activation. Based on their structure and function, Eph is divided into two classes — EphA and EphB.
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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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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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Related Experiment Video

Updated: Apr 19, 2026

Performing Intracochlear Electrocochleography During Cochlear Implantation
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Ephrins and Ephs in cochlear innervation and implications for advancing cochlear implant function.

Kenneth H Lee1, Mark E Warchol, Karen S Pawlowski

  • 1Department of Otolaryngology-Head & Neck Surgery, University of Texas Southwestern Medical Center, Dallas, Texas; Department of Developmental Biology, University of Texas Southwestern Medical Center, Dallas, Texas; Division of Pediatric Otolaryngology, Children's Medical Center, Dallas, Texas.

The Laryngoscope
|December 24, 2014
PubMed
Summary

Eph/ephrin signaling is crucial for normal cochlear innervation and hearing. Disrupting these neuronal pathfinding cues leads to abnormal inner ear wiring and hearing loss in mice.

Keywords:
Ephaxon guidancecochlear implantscochlear innervationephrin

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Otolaryngology

Background:

  • The precise wiring of the cochlea is essential for hearing.
  • Neuronal pathfinding relies on molecular cues, including cell surface proteins.
  • Eph/ephrin signaling is implicated in various developmental processes, but its role in cochlear innervation is not fully understood.

Purpose of the Study:

  • To investigate the role of Eph/ephrin signaling in establishing tonotopic innervation of the cochlea.
  • To determine if Eph/ephrin interactions guide neuronal pathfinding in the inner ear.

Main Methods:

  • Evaluated Eph and ephrin protein expression in mouse and chick inner ears using western blotting and immunohistochemistry.
  • Assessed Eph/ephrin effects on neurite outgrowth in vitro using co-culture systems.
  • Examined the anatomical and functional consequences of disrupting Eph/ephrin signaling in vivo using lipophilic dye tracing and auditory brainstem response (ABR) testing in knockout mice.

Main Results:

  • Eph and ephrin proteins were detected in the inner ear of both species.
  • EphB2 inhibited spiral ganglion cell neurite outgrowth in vitro.
  • Mice lacking functional EphB1, EphB2, and EphB3 exhibited abnormal cochlear innervation and elevated ABR thresholds, indicating hearing impairment.

Conclusions:

  • Eph/ephrin signaling plays a critical role in regulating cochlear innervation patterns.
  • Disruption of this signaling pathway results in aberrant innervation and subsequent hearing loss.
  • Ephrin-A2 may guide ganglion cells to hair cells in the chick cochlea.