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Related Concept Videos

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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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 Perception01:17

Auditory Perception

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The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the...
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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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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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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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Related Experiment Video

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Posterior Semicircular Canal Approach for Inner Ear Gene Delivery in Neonatal Mouse
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Changing shape and shaping change: Inducing the inner ear.

Raj K Ladher1

  • 1National Centre for Biological Sciences, Tata Institute for Fundamental Research, GKVK PO, Bellary Road, Bangalore, Karnataka, 560-065, India.

Seminars in Cell & Developmental Biology
|December 20, 2016
PubMed
Summary

The inner ear develops from surface ectoderm through tissue interactions that specify the otic placode. These developmental processes involve cellular changes and molecular signaling guiding the transformation into the inner ear structure.

Keywords:
InductionInner earMorphogenesisOtic placodePlacode

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Area of Science:

  • Developmental biology
  • Cell biology
  • Genetics

Background:

  • The inner ear originates from non-neural ectoderm.
  • Surrounding tissues provide crucial instructions for inner ear development.
  • These interactions progressively restrict ectodermal potential, forming the otic placode.

Purpose of the Study:

  • To review cellular and molecular interactions during otic placode formation.
  • To understand how these interactions restrict non-neural ectoderm lineage.
  • To examine how these interactions influence otic placodal cell shape and morphogenesis.

Main Methods:

  • Literature review of developmental studies.
  • Analysis of cellular signaling pathways.
  • Examination of gene expression patterns in ectoderm.

Main Results:

  • Tissue interactions progressively specify the otic placode from non-neural ectoderm.
  • Lineage restriction is guided by molecular cues from surrounding mesenchyme.
  • Coordinated cell shape changes are essential for otic placode invagination and otocyst formation.

Conclusions:

  • The formation of the otic placode is a complex process involving precise cellular and molecular coordination.
  • Understanding these interactions is key to comprehending inner ear development and potential congenital abnormalities.