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Related Concept Videos

Determination01:51

Determination

During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In contrast, determination...
Anatomy of the Ear01:16

Anatomy of the Ear

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...
The Cochlea01:13

The Cochlea

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.
Auditory Pathway01:15

Auditory Pathway

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 the...
Gastrulation01:56

Gastrulation

Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata will form...
Hair Cells01:22

Hair Cells

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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In Ovo and Ex Ovo Methods to Study Avian Inner Ear Development
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Published on: June 16, 2022

Patterning and cell fate in ear development.

Berta Alsina1, Fernando Giraldez, Cristina Pujades

  • 1Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, Parc de Recerca Biomèdica de Barcelona (PRBB), Spain.

The International Journal of Developmental Biology
|February 28, 2009
PubMed
Summary
This summary is machine-generated.

This review details how early developmental signals pattern the inner ear, guiding cell fate decisions for sensory hair cells and neurons. Understanding these processes is key to inner ear development and function.

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Area of Science:

  • Developmental Biology
  • Neuroscience
  • Otolaryngology

Background:

  • The inner ear is crucial for vertebrate audition and balance.
  • It comprises specialized sense organs with hair cells, supporting cells, neurons, and Schwann cells.
  • Hair cells transduce mechanical stimuli, while otic neurons transmit neural impulses to the brain.

Purpose of the Study:

  • To review recent advancements in understanding early inner ear development.
  • To explore the patterning of the otic placode and otic vesicle.
  • To examine genes involved in neuronal and sensory hair cell fate determination.

Main Methods:

  • Review of existing scientific literature.
  • Analysis of developmental signaling pathways.
  • Genetic studies on cell fate determination.

Main Results:

  • Early patterning of the otic placode is essential for inner ear organization.
  • Neural tube signals play a critical role in otic vesicle patterning.
  • Specific genes govern the differentiation of inner ear neurons and sensory hair cells.

Conclusions:

  • Precise spatial and temporal regulation of cell fate decisions is fundamental to inner ear development.
  • Further research into these developmental mechanisms can inform therapeutic strategies for hearing and balance disorders.