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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]
It is a spiral-shaped cavity in the bony labyrinth, in humans making 2.75 turns around its axis, the modiolus. [2] [3] A core component of the cochlea is the organ of Corti, the sensory organ of hearing, which is distributed along the partition separating the fluid chambers in the coiled tapered tube of the cochlea.
The hair cells are the primary auditory receptor cells and they are also known as auditory sensory cells, acoustic hair cells, auditory cells or cells of Corti. The organ of Corti is lined with a single row of inner hair cells and three rows of outer hair cells. The hair cells have a hair bundle at the apical surface of the cell.
Section through the spiral organ of Corti, magnified. The stereocilia are the "hairs" sticking out of the tops of the inner and outer hair cells.. As acoustic sensors in mammals, stereocilia are lined up in the organ of Corti within the cochlea of the inner ear.
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.
In mammals, the auditory hair cells are located within the spiral organ of Corti on the thin basilar membrane in the cochlea of the inner ear. They derive their name from the tufts of stereocilia called hair bundles that protrude from the apical surface of the cell into the fluid-filled cochlear duct .
The number of neurons in the spiral ganglion is estimated to be about 35,000–50,000. [1] Two apparent subtypes of spiral ganglion cells exist. Type I spiral ganglion cells comprise the vast majority of spiral ganglion cells (90–95% in cats and 88% in humans [2]), and exclusively innervate the inner hair cells. They are myelinated, bipolar ...
The crista ampullaris itself is a cone-shaped structure, covered in receptor cells called "hair cells". Covering the crista ampullaris is a gelatinous mass called the cupula . Upon angular acceleration (rotation), the endolymph within the semicircular duct deflects the cupula against the hair cells of the crista ampullaris.