![]() * Note: PDF files require a viewer such as the free Adobe Reader. The auditory nerve carries this electrical signal to the brain, which turns it into a sound that we recognize and understand.When that happens, chemicals rush into the cells, creating an electrical signal. Bending causes pore-like channels, which are at the tips of the stereocilia, to open up. As the hair cells move up and down, microscopic hair-like projections (known as stereocilia) that perch on top of the hair cells bump against an overlying structure and bend.Those closer to the center detect lower-pitched sounds, such as a large dog barking. Hair cells near the wide end of the snail-shaped cochlea detect higher-pitched sounds, such as an infant crying. Hair cells-sensory cells sitting on top of the basilar membrane-ride the wave. Once the vibrations cause the fluid inside the cochlea to ripple, a traveling wave forms along the basilar membrane.This partition is called the basilar membrane because it serves as the base, or ground floor, on which key hearing structures sit. An elastic partition runs from the beginning to the end of the cochlea, splitting it into an upper and lower part. The bones in the middle ear amplify, or increase, the sound vibrations and send them to the cochlea, a snail-shaped structure filled with fluid, in the inner ear.These bones are called the malleus, incus, and stapes. The eardrum vibrates from the incoming sound waves and sends these vibrations to three tiny bones in the middle ear.ICX with a topographic signal that instructs the representation of auditory cue values in the. ![]()
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