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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]
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 ...
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 ...
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]
For one, the tall hair cell is very similar in function to that of the inner hair cell, and the short hair cell, lacking afferent auditory-nerve fiber innervation, resembles the outer hair cell. One unavoidable difference, however, is that while all hair cells are attached to a tectorial membrane in birds, only the outer hair cells are attached ...
There are two types of hair cells specific to the auditory system; inner and outer hair cells. Inner hair cells are the mechanoreceptors for hearing: they transduce the vibration of sound into electrical activity in nerve fibers, which is transmitted to the brain. Outer hair cells are a motor structure.
[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 ...
Stereocilia are found in: the vas deferens. the epididymis. Some consider epididymal stereocilia to be a variant of microvilli, rather than their own distinct type of structure. [2] the sensory (hair) cells of the inner ear.