Otolaryngology - Head and Neck Surgery
Otology and Neurotology (Ear Surgery)
About the ossicles
There are three ossicles (bones of hearing). The ossicles conduct the sounds from the eardrum into the inner ear.

Diseases such as cholesteatoma and chronic infection with discharge can erode or destroy the bones. Trauma to the head may disrupt the bones.
In some cases, hard plaque deposits on the bones result in decreased mobility of the ossicles. Otosclerosis causes fixation of the stapes bone. These conditions result in a conductive hearing loss.
Ear surgery specialty page.
About ear anatomy.
About ear diseases and treatments.