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Cochlear otosclerosis: a review of audiometric findings in 150 cases
The American Journal of Otology
|January 1, 1987
Abstract:
Audiometric findings and histories were reviewed for 150 patients diagnosed by polytomography as probable cochlear otosclerosis cases. Most patients were under 65 and had a relatively short duration of hearing impairment. Most had a mild to moderate loss with excellent speech discrimination. Seventy-five percent of the ears had acoustic reflex findings indicative of minimal stapes fixation. We recommend the acoustic reflex test for identification of patients with probable cochlear otosclerosis.
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01:13The Cochlea
The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
01:11The Auditory Ossicles
The auditory ossicles of the middle ear transmit sounds from the air as vibrations to the fluid-filled cochlea. The auditory ossicles consist of two malleus (hammer) bones, two incus (anvil) bones, and two stapes (stirrups), one on each side. These bones develop during the fetal stage and are the ones to ossify first. They are fully mature at birth and do not grow afterward.
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...