conductive deafness

con·duc·tive deafness (kn-dktv)

n.

Hearing loss or impairment caused by a defect in part of the ear that conducts sound, specifically the external canal or middle ear.

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deafness

lack or loss, complete or partial, of the sense of hearing.

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conductive deafness

sound vibrations are interrupted in the outer or middle ear and do not reach the inner ear and its nerve endings.

congenital deafness

infrequent in dogs and cats, not recorded in other species. In most cases is due to cochlear duct degeneration. See also inherited deafness (below).

cortical deafness

that due to disease of the cortical centers of the cerebrum.

inherited deafness

occurs in some blue-eyed white cats and in some dog breeds; particularly common in the Dalmatian. In some cases it is associated with coat coloration, e.g. white Bull terriers, merle collies and Old English sheepdogs.

nerve deafness

due to degeneration of the acoustic sensory organ. Most common in dogs at an early age and associated with incomplete pigmentation of the haircoat and the uvea, in animals with a white or merle coat color. Occurs also in mink, cats and mice.

sensorineural deafness

due to damage of the inner ear nerve endings, the cochlear portion of the eighth cranial nerve, the vestibulocochlear nerve, or the cortical hearing center. See also nerve deafness (above).

toxic deafness

overdosing with aminoglycoside antibiotics causes deafness.

transmission deafness

conductive hearing loss.