HEARING IMPAIRMENT

There can be a number of causes of decreased hearing causing conductive deafness. Conductive deafness means decreased hearing due to impairment in conduction of sound from external auditory canal to inner ear. The sound enters the external auditory canal, makes the drum vibrate, then gets transmitted due to movement of three small bones namely malleus ,incus and stapes which amplifies and concentrates the sound. Stapes is the smallest bone of the human body.From stapes ,this sound wave travels to the inner ear via oval window. Anything wrong with the above mechanism causes conductive deafness.