deafness (redirected from International Symbol for Deafness)

deafness /deaf·ness/ (-nes) hearing loss; lack or loss, complete or partial, of the sense of hearing.

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acoustic trauma deafness  that due to blast injury.

Alexander's deafness  congenital deafness due to cochlear aplasia, chiefly of the organ of Corti and adjacent ganglion cells, with high-frequency hearing loss results.

conduction deafness , conductive deafness conductive hearing loss.

labyrinthine deafness  that due to disease of the labyrinth.

Michel's deafness  congenital deafness due to total lack of development of the inner ear.

Mondini's deafness  congenital deafness due to dysgenesis of the organ of Corti, with partial aplasia of the bony and membranous labyrinth and a resultant flattened cochlea.

nerve deafness , neural deafness that due to a lesion of the auditory nerve on the central neural pathways.

pagetoid deafness  that seen in osteitis deformans of the bones of the skull.

perceptive deafness  sensorineural hearing loss.

transmission deafness  conductive hearing loss.

word deafness  auditory aphasia.

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deaf·ness (dfns)

n.

The lack or loss of the ability to hear.

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deafness (def´nes),

n a condition characterized by a partial or complete loss of hearing.

deafness, central,

n impaired hearing caused by interference with cerebral auditory pathways or in the auditory centers in the brain (e.g., cerebrovascular accidents and other degenerative brain diseases). Hearing aids are of little benefit.

deafness, conduction

n See deafness, transmission.

deafness, nerve,

n impaired hearing caused by pathologic conditions in the auditory nerve or the hair cells of the organ of Corti in the inner ear (e.g., high-tone deafness, which comes with age; damage to the organ of Corti by noise; or a tumor of an auditory nerve). Hearing aids are usually of little benefit.

deafness, transmission (conduction deafness),

n impaired hearing caused by interference with passage of sound waves through the external ear (e.g., interference caused by wax) or middle ear (e.g., interference caused by otitis media, aerotitis media, or otosclerosis). May be characterized by greater interference with hearing of low tones. Hearing aids that amplify may be helpful.

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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.