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Related Concept Videos

Hair Cells01:22

Hair Cells

40.9K
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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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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Equilibrium and Balance01:15

Equilibrium and Balance

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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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Unrenewable Cells00:50

Unrenewable Cells

2.3K
In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of...
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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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Targeted cell interconversions reveal inner hair cell control of organ of Corti cytoarchitecture.

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Differential Chromatin Accessibility, Gene Expression, and mRNA Splicing Between Developing Cochlear Inner and Outer Hair Cells.

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Tbx2 is a master regulator of inner versus outer hair cell differentiation.

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Codeficiency of Lysosomal Mucolipins 3 and 1 in Cochlear Hair Cells Diminishes Outer Hair Cell Longevity and Accelerates Age-Related Hearing Loss.

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Related Experiment Video

Updated: Aug 9, 2025

In Ovo and Ex Ovo Methods to Study Avian Inner Ear Development
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In Ovo and Ex Ovo Methods to Study Avian Inner Ear Development

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Precision patterning: How inner hair cells "hop" to it.

Jemma L Webber1, Jaime García-Añoveros1

  • 1Departments of Anesthesiology, Neurology, and Neuroscience, Hugh Knowles Center for Hearing Research, Northwestern University, Chicago, IL 60611, USA.

Science Advances
|February 22, 2023
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Summary

Cell fate determination in the inner ear relies on Notch signaling, physical forces, and cell adhesion. These factors work together to create the precise arrangement of auditory hair and supporting cells.

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Area of Science:

  • Developmental biology
  • Cell biology
  • Auditory system development

Background:

  • The inner ear contains specialized sensory cells crucial for hearing.
  • Understanding the mechanisms of cell differentiation and arrangement is key to developmental biology.

Purpose of the Study:

  • To elucidate the combined roles of Notch signaling, mechanical forces, and cell adhesion in patterning inner ear sensory and supporting cells.

Main Methods:

  • Investigated cell-cell interactions and mechanical cues during inner ear development.
  • Utilized genetic and biophysical approaches to analyze cell fate decisions.

Main Results:

  • Notch-mediated lateral inhibition, mechanical forces, and differential adhesion were identified as key regulators.
  • These factors collectively orchestrate the formation of a single row of alternating inner hair cells and supporting cells.

Conclusions:

  • A synergistic interplay of signaling pathways and physical forces drives the precise spatial organization of inner ear cells.
  • This study provides insights into the fundamental principles of developmental patterning in sensory organ formation.