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Auditory Pathway

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...

Pleiotropy

Pleiotropy

Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...

Determination

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 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...

The Cochlea

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.

The Auditory Ossicles

The Auditory Ossicles

The auditory ossicles of the middle ear transmit sounds from the air as vibrations to the fluid-filled cochlea. The auditory ossicles consist of two malleus (hammer) bones, two incus (anvil) bones, and two stapes (stirrups), one on each side. These bones develop during the fetal stage and are the ones to ossify first. They are fully mature at birth and do not grow afterward.
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...

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Updated: May 7, 2026

Selective Tracing of Auditory Fibers in the Avian Embryonic Vestibulocochlear Nerve

Selective Tracing of Auditory Fibers in the Avian Embryonic Vestibulocochlear Nerve

Published on: March 18, 2013

Expression and function of scleraxis in the developing auditory system.

Zoe F Mann¹, Weise Chang, Kyu Yup Lee

¹Laboratory of Cochlear Development, NIDCD, NIH, Bethesda, Maryland, United States of America.

|September 24, 2013

Summary

This summary is machine-generated.

The transcription factor Scleraxis (Scx) is crucial for hearing development in mice. Its absence leads to hearing impairment, suggesting unknown cochlear functions.

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Last Updated: May 7, 2026

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Area of Science:

Developmental biology
Genetics
Otolaryngology

Background:

Scleraxis (Scx) is a bHLH transcription factor vital for tendon, ligament, and chondrogenic cell development.
Scx expression has been previously observed in the cochlea, but its functional significance remains unclear.

Purpose of the Study:

To investigate the spatial and temporal expression patterns of Scx in the developing mouse cochlea.
To determine the functional role of Scx in cochlear development and auditory function.

Main Methods:

Utilized a Scleraxis-GFP reporter mouse line to track Scx expression from embryonic day 13.5 to postnatal day 25.
Analyzed auditory brainstem response (ABR) thresholds and distortion product otoacoustic emission (DPOAE) amplitudes in Scx-deficient mice (Scx(-/-)).

Main Results:

Scx expression was observed broadly in the embryonic cochlear duct and mesenchyme, later restricted to inner hair cells and spiral limbus interdental cells postnatally.
Scx deletion resulted in significant hearing impairment, evidenced by elevated ABR thresholds and reduced DPOAE amplitudes across various frequencies.
No alterations in gross cochlear morphology or expression of known Scx target genes (Col2A, Bmp4, Sox9) were detected in Scx(-/-) mutants.

Conclusions:

Scleraxis (Scx) plays a critical role in the development of auditory function within the cochlea.
The observed hearing defects in Scx-deficient mice may stem from unidentified Scx-dependent pathways crucial for cochlear function.