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Hair cells are only regenerated after damage. [21] Hair cells in chicks are regenerated just three days after damage is inflicted, and the hair cells fully recover within 30 days. [22] Supporting cells begin to replicate and form hair cells within 18–24 hours after damage, and this process peaks in 2–3 days. [23]
Outer hair cells are found only in mammals. While hearing sensitivity of mammals is similar to that of other classes of vertebrates, without functioning outer hair cells, the sensitivity decreases by approximately 50 dB. [15] Outer hair cells extend the hearing range to about 200 kHz in some marine mammals. [16]
Stereocilia (along with the entirety of the hair cell) in mammals can be damaged or destroyed by excessive loud noises, disease, medications, as well as toxins and are not regenerable. [ 3 ] [ 11 ] Environmental noise induced hearing impairment is probably the most prevalent noise health effect according to the U.S. Environmental Protection ...
Once outer hair cells are damaged, they do not regenerate, and the result is a loss of sensitivity and an abnormally large growth of loudness (known as recruitment) in the part of the spectrum that the damaged cells serve. [13] While hearing loss has always been considered irreversible in mammals, fish and birds routinely repair such damage. A ...
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.
[5] [6] Furthermore, Hensen's cells are also able to regenerate the damaged hair cells in some vertebrates; they undergo phagocytosis to eject the dead or injured hair cells, and reproduce both new hair cells and supporting cells into the cell cycle. One of the reasons is that the supporting cells are differentiated by the embryonic hair cells ...
The brain suppresses this, and we ignore it and know that our body is stabilized. If the head moves or the body accelerates or decelerates, then bending occurs. Depending on the direction of bending, the hair cells will either be excited or inhibited resulting in either an increase or decrease in firing frequency of the hair cells.
As the study of the cochlea should fundamentally be focused at the level of hair cells, it is important to note the anatomical and physiological differences between the hair cells of various species. In birds, for instance, instead of outer and inner hair cells, there are tall and short hair cells.