Cochlear Duct Ear Training Model

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Model Number: VS03478645

Brand: Niche Healthcare 


350X life size, composed of 5 parts. This model shows a three dimensional section of the cochlear duct, tectorial membrane, basilar membrane and vestibular membrane. The organ of Corti is well represented, including the cellular acoustic receptors that transform sound vibrations to electric signals.

SKU: NH-77404 Category: Tag:


Categories         Anatomical Model

Subject               Medical Science

Material              Eco-friendly PVC

Application       School/Hospital/Laboratory


The cochlear duct, also known as the scala media, is an essential component of the inner ear within the cochlea. It plays a crucial role in the process of hearing by housing the organ of Corti, which contains the sensory hair cells responsible for converting sound vibrations into electrical signals that can be interpreted by the brain. Here is a detailed overview of the cochlear duct:

Anatomy of the Cochlear Duct


The cochlear duct is located within the cochlea, a spiral-shaped structure in the inner ear.


  • Basilar Membrane: Forms the floor of the cochlear duct and supports the organ of Corti.
  • Reissner’s Membrane (Vestibular Membrane): Forms the roof of the cochlear duct.
  • Stria Vascularis: A vascularized structure that lines the outer wall of the cochlear duct and produces endolymph.


  • Endolymph: Fills the cochlear duct and has a high potassium concentration, essential for the function of the hair cells.
  • Perilymph: Surrounds the cochlear duct, filling the scala vestibuli and scala tympani, the two other chambers of the cochlea.

Function of the Cochlear Duct

Sound Transmission:

  • Sound waves enter the cochlea through the oval window, creating pressure waves in the perilymph of the scala vestibuli.
  • These waves travel through the perilymph, causing the basilar membrane to vibrate at specific locations depending on the frequency of the sound.

Role in Hearing:

  • The vibrations of the basilar membrane cause the hair cells in the organ of Corti to move against the tectorial membrane.
  • This movement results in the bending of the stereocilia on the hair cells, leading to the opening of ion channels and the generation of electrical signals.
  • These electrical signals are transmitted to the brain via the auditory nerve, where they are interpreted as sound.

Ion Regulation:

The endolymph within the cochlear duct, produced by the stria vascularis, is crucial for maintaining the ionic environment necessary for hair cell function.

Organ of Corti


Located on the basilar membrane within the cochlear duct.

Composed of inner and outer hair cells, supporting cells, and the tectorial membrane.


Inner hair cells convert mechanical vibrations into electrical signals.

Outer hair cells amplify the mechanical vibrations, enhancing the sensitivity and selectivity of hearing.

Clinical Relevance

Hearing Loss:

Damage to the hair cells or the structures within the cochlear duct can result in sensorineural hearing loss.

Exposure to loud noises, aging, infections, and genetic factors can all contribute to damage in the cochlear duct.

Cochlear Implants:

For individuals with severe hearing loss, cochlear implants can bypass damaged hair cells by directly stimulating the auditory nerve.

Understanding the cochlear duct’s structure and function is essential for comprehending how the ear processes sound and for diagnosing and treating various hearing disorders.


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What Organs Are In The Human Body?


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