deaf

Hearing impairment is clinically divided into two categories: conductive deafness and neurological (sensory) deafness. Conductive deafness refers to hearing loss caused by damage to the "tympanic membrane-ossicular chain" system of the external auditory canal to the middle ear; neurological deafness is a sensory disease, which refers to the damage to the nerve conduction pathway related to the cochlea or auditory nerve to the auditory center , Causing hearing loss or disappearance, also known as sensorineural hearing loss. The former sound waves can also be transmitted from the skull to the inner ear through bone conduction, and the latter can weaken or lose hearing due to nerve damage. Tinnitus is the conscious hearing of sounds in the ear, which is an irritating lesion of the cochlear neural stem or nerve endings. At present, most scholars also advocate the classification of hearing impairment.