If the auditory nerve is damaged, can it regenerate?
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If the auditory nerve is damaged, can it regenerate?
Unfortunately, the auditory nerve cannot regenerate or is difficult to regenerate. Generally, drug treatment can be used in the early stage of the disease to relieve symptoms. If the drug is ineffective, Hearing Aids can be used to compensate for hearing and improve the current hearing situation.The auditory nerve is composed of the cochlear nerve and the vestibular nerve, which pass through the internal auditory canal to the inner ear. Therefore, they can often be damaged at the same time, manifesting as symptoms of hearing and balance, although they are two different components of the same nerve. Partially, but responses to the cause are less consistent.
There are three types of cells in the human body that cannot or are difficult to regenerate after injury: nerve cells, cardiomyocytes, and skeletal muscle cells. In the early stages of auditory nerve injury, dehydration drugs, glucocorticoids, vasodilator drugs, neurotrophic and metabolic drugs can be used. If damage to the auditory nerve causes hearing impairment, don’t be discouraged if drug treatment is ineffective. At this time, you can also try to use hearing aids to assist hearing.
Causes of damage to the auditory nerve
1. Noise
The path of sound conduction is as follows: the sound signal passes through the external auditory canal-tympanic membrane vibration- Ossicular chain (mallus, stapes, incus) - Fluid vibration in the inner ear - Electrical impulses occur in the cochlear hair cells - Auditory nerve - Sound receptors in the center of the brain, so we hear sounds. If there is a problem with any part of this link, the sound may not be heard. In the past, the main cause of hearing loss was industrial noise, but with the invention of the Walkman, the culprit causing damage to the auditory nerve has become music. Long-term, high-volume music damages hearing by damaging the hair cells, auditory nerve fibers, auditory neurons and capillary spasm of the inner ear.
Sound damage to hearing is mainly divided into two categories: one is a sudden loud sound, such as setting off firecrackers; the other isThe first type is chronic noise. If you work under high noise for a long time, your hearing will be harmed unknowingly.
2. Stress
Stress is likely to cause sudden deafness, which is a type of neurological deafness. It usually occurs when one ear suddenly loses hearing. It is also accompanied by tinnitus and a feeling of fullness in the ears. Pathogenesis: Stress, fatigue, emotional excitement, viral infection and other factors lead to an increase in adrenaline secretion in the body, spasm and contraction of the small arteries of the inner ear microcirculation, leading to ischemia and hypoxia in the inner ear, causing inner ear lesions and damage to the sensory part of the inner ear. , causing hearing loss.
3. Drugs
Commonly used antibiotics that can damage the auditory nerve include streptomycin, dihydrostreptomycin, gentamicin, kanamycin, puromycin, neomycin, and vancomycin. Mycin, tobramycin, kasugamycin, etc. Some other commonly used drugs can also damage the auditory nerve and cause deafness, such as aspirin, furosemide, propranolol, diuretic acid, quinidine and anticonvulsant drugs. If these drugs are used together, the incidence of adverse drug reactions will increase due to drug interactions.4. Diseases
Otitis media, acoustic neuroma, otosclerosis, etc. are all diseases that may directly lead to hearing loss. Through early treatment, most people can avoid deafness. Causes of cochlear nerve damage: Common causes include neuritis, meningitis, trauma, poisoning, tumors, arteriosclerosis, certain genetic diseases, middle ear, and inner ear diseases, etc. Causes of vestibular nerve damage: poisoning, blood circulation disorders (basilar atherosclerosis, hypertension, etc.), neuritis, tumors, trauma, demyelinating disease, inner ear disease, etc. Due to different causes, the pathogenesis is also different, which can be demyelination, inflammatory cell infiltration, cell degeneration and compression, etc.
5. Heredity
50% of deafness is hereditary, that is, congenital damage to the auditory nerve, which has a genetic basis. Some children are born hearing but later lose their hearing. Cochlear implant technology can convert external sounds into electronic sound signals that directly act on the auditory nerve. Through training, children can speak and live like normal children.