Manifesting initially in the so-called fenestral phase with resorptive changes at the level of the oval window
, otosclerosis progresses over time to involve the cochlear promontory and otic capsule.
In this experiment, the animals underwent surgeries to create dehiscence close to the oval window
and distal to the oval window
, with a size of 1.0 x 0.5 mm and 0.5 x 0.5 mm, within 1 mm or more than 3 mm from the superior semicircular canal crista.
The hearing loss is due to malposition of the stapes on the oval window
. When present, genetic bone disorders frequently affect both the conductive and sensorineural hearing systems.
According to this study, cholesteatoma had extension beyond the aditus and antrum, 61% of attic, 37% of sinus tympani, and 16% of tensa.7 In tympanic cavity, oval window
and sinus tympani were the most commonly involved parts (46.7% and 40.7%).
Sensorineural hearing loss or inner ear problems are a result of damage or defects to the oval window
, cochlea, or the auditory nerve.
Otosclerosis usually affects the last bone in the chain, the stapes, which rests in the entrance to the inner ear (the oval window
The stirrup is attached to something called the oval window
on the cochlea.
The most common pathologies affecting the ear are, as described in the available literature, immobilization of the stapes, as well as a thickened and fragile footplate, accompanied occasionally by obliteration of the oval window
In the presence of a mobile oval window
(footplate) in patients without a stapes suprastructure, providing a columella between the graft/malleus and oval window
The most common site of dehiscence was around the oval window
The incus then articulates with the stapes, and the footplate of the stapes is attached to the oval window
. Vibrations of the tympanic membrane are transmitted along these ossicles to the oval window
The first floor is approached via a return staircase which is complimented by a half landing with an ornate oval window