What mechanism causes hair cell depolarization as stereocilia bend in response to sound waves? Tip links open ion channels, which causes membrane depolarization.
- Does hearing results from the bending of stereocilia?
- When sound waves bend stereocilia what happens?
- How does the movement of stereocilia cause depolarization of the hair cell?
- What causes the stereocilia to bend in hearing?
- What causes depolarization of stereocilia?
- What occurs when sound vibrations make the stereocilia sway in an inner hair cell?
- What are stereocilia and what is their role in hearing?
- What causes the stereocilia to bend?
- What happens when hair cells depolarize?
- What causes bending of hair cells?
Does hearing results from the bending of stereocilia?
*The sense organ for hearing, called the spiral organ, is located in the cochlear canal. Hearing actually results from the bending of stereocilia. *Stereocilia of the hair cells embedded in the tectorial membrane bend, and this initiates nerve signals that are interpreted as sound.
When sound waves bend stereocilia what happens?
Bending of higher stereocilia under the influence of a sound wave causes mechanical opening of the mechanoelectrical transducer (MET) channels on the membranes of lower stereocilia by tensioning the tip of each lower stereocilium with the side wall of its associated higher one.
How does the movement of stereocilia cause depolarization of the hair cell?
As the basilar membrane moves up in response to fluid movement in the scala tympani, the taller stereocilia are displaced against the tectorial membrane. This causes ion channels at the tips of the stereocilia to open, allowing potassium flow along the electrical gradient to depolarize the cell (Fig.
040 The Role Of Hair Cells In Hearing
What causes the stereocilia to bend in hearing?
The resultant shearing forces between the reticular lamina and the tectorial membrane displace or bend the longest of the stereocilia, exciting the nerve fibres at the base of the hair cells.
What causes depolarization of stereocilia?
When the hair bundle is displaced in the direction of the tallest stereocilium, more transduction channels open, causing depolarization as K+ enters the cell.
What occurs when sound vibrations make the stereocilia sway in an inner hair cell?
Vibrations caused by sound waves bend the stereocilia on these hair cells via an electromechanical force. The hair cells convert mechanical energy into electrical energy that is transmitted to the central nervous system via the auditory nerve to facilitate audition.
2-Minute Neuroscience: The Cochlea
What are stereocilia and what is their role in hearing?
Stereocilia are actin-based protrusions on auditory and vestibular sensory cells that are required for hearing and balance. They convert physical force from sound, head movement or gravity into an electrical signal, a process that is called mechanoelectrical transduction.
What causes the stereocilia to bend?
OHC stereocilia are bent by a shearing force that occurs when up-and-down movements of the basilar membrane cause it to slide relative to the tectorial membrane, a jelly-like sheet that covers the organ of Corti and in which many OHC stereocilia are embedded.
Ossm Neuro Chapter 11 - Sound Transduction
What happens when hair cells depolarize?
When a hair cell depolarizes, voltage-gated calcium channels at the base of the cell open, and the resulting influx of calcium causes synaptic vesicles to fuse to the cell membrane and to release a neurotransmitter into the synaptic cleft between the hair cell and the cochlear nerve fibers (Fig. 21.4).
What causes bending of hair cells?
The movement of the fluid in the inner ear causes the hair cells in the cochlea to bend. The hair cells change the movement into electrical impulses. These electrical impulses are transmitted to the hearing (auditory) nerve and up to the brain, where they are interpreted as sound.