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Cross-section through the spiral organ of Corti at greater magnification, showing position of the hair cells on the basement membrane. The organ of Corti is located in the scala media of the cochlea of the inner ear between the vestibular duct and the tympanic duct and is composed of mechanosensory cells, known as hair cells. [2]
The organ of Corti, the sensory epithelium, a cellular layer on the basilar membrane, in which sensory hair cells are powered by the potential difference between the perilymph and the endolymph; Hair cells, sensory cells in the organ of Corti, topped with hair-like structures called stereocilia
The development of the most basic basilar papilla (the auditory organ that later evolved into the Organ of Corti in mammals) happened at the same time as the water-to-land transition of vertebrates, approximately 380 million years ago. [7] The actual coiling or spiral nature of the cochlea occurred to save space inside the skull. [3]
The cochlear duct contains the organ of Corti. [ 2 ] [ 5 ] This is attached to the basilar membrane. [ 5 ] It also contains endolymph , which contains high concentrations of K + for the function of inner hair cells and outer hair cells in the organ of Corti.
Section through the organ of Corti, showing inner and outer hair cells. The deflection of the hair-cell stereocilia opens mechanically gated ion channels that allow any small, positively charged ions (primarily potassium and calcium) to enter the cell. [10] Unlike many other electrically active cells, the hair cell itself does not fire an ...
The organ of Corti is located in this duct on the basilar membrane, and transforms mechanical waves to electric signals in neurons. The other two sections are known as the scala tympani and the scala vestibuli. These are located within the bony labyrinth, which is filled with fluid called perilymph, similar in composition to cerebrospinal fluid.
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The tunnel of corti, which runs through the Organ of Corti, divides the OHCs and the inner hair cells (IHCs). OHCs are connected to the reticular laminar and the Deiters' cells. There are roughly twelve thousand OHCs in each human ear, and these are arranged in up to five rows.