Ear potential that is transmitted along the spiral ganglion, which sends information through the auditory portion of the vestibulocochlear nerve to the temporal lobe of the brain. The human ear can generally hear sounds with frequencies between 20 Hz and 20 kHz (the audio range). Sounds outside this range are considered infrasound (below 20 Hz) or ultrasound (above 20 kHz) Although hearing requires an intact and functioning auditory portion of the central nervous system as well as a working ear, human deafness (extreme insensitivity to sound) most commonly occurs because of abnormalities of the inner ear, rather than in the nerves
Diabetes mellitus and deafness hearing loss. This begins with a reduction in the perception of frequencies above approximately 5 kHz which progressively declines, over the years, to severe hearing loss at all frequencies. The diabetes that accompanies the hearing loss can be similar to Type 1 diabetes or Type 2 diabetes; however, Type 1-like diabetes is the more common form of the two. MIDD has also been associated with a number of other issues including kidney dysfunction, gastrointestinal problems, and cardiomyopathy. MIDD represents 1% of people who have diabetes. Over 85% of people that carry the mutation in mitochondrial DNA at position 3243 present